Cataclysmic variable stars (CV) are stars which irregularly increase in brightness by a large factor, then drop back down to a quiescent state. They were initially called novae, from the Latin 'new', since ones with an outburst brightness visible to the naked eye and an invisible quiescent brightness appeared as new stars in the sky.
Cataclysmic variable stars are binary stars that consist of two components; a white dwarf primary, and a mass transferring secondary. The stars are so close to each other that the gravity of the white dwarf distorts the secondary, and the white dwarf accretes matter from the companion. Therefore, the secondary is often referred to as the donor star. The infalling matter, which is usually rich in hydrogen, forms in most cases an accretion disc around the white dwarf. Strong UV and X-ray emission is often seen from the accretion disc. The accretion disk may be prone to an instability leading to dwarf nova outbursts, when a portion of the disk material falls onto the white dwarf, resulting in release of radiation derived from the loss of gravitational potential energy. The brighter and less frequent nova outbursts occur when the density and temperature at the bottom of the accumulated hydrogen layer rise high enough to ignite runawayhydrogen fusion reactions, which rapidly convert the hydrogen layer to helium.
This simulation shows a white-dwarf/Red Giant binary star system. Matter from the red giant is spilling through the Roche lobe onto the white dwarf, via a hot spot and an accretion disk. This is believed to be an accurate representation of a dwarf nova.
This simulation is one of many made during creation of the Australian National University's free online astrophysics courses:
https://www.edx.org/xseries/astrophysics
It was created using the VPython library (vpython.org)
published: 15 Oct 2015
Cataclysmic Variable Star V344 Lyrae's Superhumps
The timing capabilities and sensitivity of Kepler, NASA's observatory to find Earth-sized planets within the habitable zone of stars, are well matched to the timescales and amplitudes of accretion disk variability in cataclysmic variables. This instrumental combination provides an unprecedented opportunity to test and refine stellar accretion paradigms with high-precision, uniform data, containing none of the diurnal or season gaps that limit ground-based observations. We present a 3-month, 1 minute cadence Kepler light curve of V344 Lyr, a faint, little-studied dwarf nova within the Kepler field. The light curve samples V344 Lyr during five full normal outbursts and one superoutburst. Surprisingly, the superhumps found during superoutburst continue to be detected during the following quie...
published: 23 May 2011
Cataclysmic Variables (CVs/ AMCVns)
Part of the ZTF summer school 2021 lectures
Speaker: Jan van Roestel (Caltech)
published: 12 Sep 2021
Cataclysmic variable star
Binary star effect for Starfall Online.
https://starfall-online.ru
published: 12 Jan 2020
Deciphering accretion in cataclysmic variables - Paula Szkody - University of Washington -11/30/2022
This is a high-level research talk designed for professional astronomers. It is part of the Caltech Astronomy Colloquium Series, hour-long presentations given weekly by top scientists from around the world to the members of our department. All are welcome to watch these colloquium presentations; however, for talks specifically designed for the general public, please see our Caltech Astro Outreach channel: https://youtube.com/c/caltechastro. Timestamps and abstract are included below.
Date: 11/30/22
Speaker: Prof. Paula Szkody, University of Washington
Title: Deciphering accretion in cataclysmic variables
Abstract : The close binaries containing a white dwarf primary and undergoing active accretion that are called Cataclysmic Variables have been known for more than 70 years. While much ...
published: 02 Feb 2023
Eruptive and Cataclysmic Variables
PHYS 1403 Lecture
published: 21 Jun 2020
Animation of a cataclysmic variable observed with the Krizmanich Telescope
Third-year law student Colin Littlefield has observed the cataclysmic variable, CSS 081231:071126+440405, using the Sarah L. Krizmanich Telescope at the University of Notre Dame. This video an animation of the star for 13 minutes, which has been sped up to illustrate the eclipse that happens every two hours.
published: 23 Apr 2014
An introduction to variable star astronomy and cataclysmic variables
A talk given by Jeremy Shears to the Herefordshire Astronomical Society on 22nd June 2020.
Jeremy is Director of the BAA Variable Star Section and a keen observer of variable stars from his observatory in Cheshire. He frequently collaborates with professional astronomers on research into cataclysmic variables. Jeremy was BAA President from 2015-17 and is currently the Association's Papers Secretary. By day he is Chief Scientist at Shell, focusing on the transition to new energy systems.
Jeremy discusses variable and cataclysmic stars and explains how to observe them.
published: 04 Jul 2020
Cataclysmic Variables - Stars That Go Boom
Cataclysmic Variables are a broad class of variables that undergo violent nuclear outbursts. These events can quickly drive their brightness up many magnitudes. They include the familiar novae and supernovae, but also include other varietals like dwarf novae, recurrent novae, nova-like variables, polars, intermediate polars and all kinds of variable stars that light off with little or no warning. Most cataclysmic variables are binary star systems where a white dwarf siphons mass from the companion. In the presentation, we’ll discuss how these binary systems that start off as a pair of normal main sequence stars eventually go so horribly awry. We’ll also talk about the work amateur astronomers have done for the AAVSO and for pro-am collaborations like the Center for Backyard Astrophys...
published: 03 Oct 2020
X-ray view of Cataclysmic Variable Stars by Vikram Rana - Showcasing RRI 10/11/2022
Cataclysmic variables (CVs) are a type of binary system containing a white dwarf as a primary compact object, accreting material from a late-type main sequence secondary star. X-rays are produced by the accretion process in these systems. These are ideal laboratory for studying the geometry of a binary system as well as various physical mechanisms responsible for producing emissions at different energies. I will discuss the X-ray characteristics of these interesting sources and present our recent results on a rare sub-class of CVs, namely, Asynchronous Polars. I will also briefly discuss the importance of X-ray-focusing optics in studying such systems and our efforts to develop technology for hard X-ray optics.
The Raman Research Institute is a premier research Institute founded by India...
This simulation shows a white-dwarf/Red Giant binary star system. Matter from the red giant is spilling through the Roche lobe onto the white dwarf, via a hot s...
This simulation shows a white-dwarf/Red Giant binary star system. Matter from the red giant is spilling through the Roche lobe onto the white dwarf, via a hot spot and an accretion disk. This is believed to be an accurate representation of a dwarf nova.
This simulation is one of many made during creation of the Australian National University's free online astrophysics courses:
https://www.edx.org/xseries/astrophysics
It was created using the VPython library (vpython.org)
This simulation shows a white-dwarf/Red Giant binary star system. Matter from the red giant is spilling through the Roche lobe onto the white dwarf, via a hot spot and an accretion disk. This is believed to be an accurate representation of a dwarf nova.
This simulation is one of many made during creation of the Australian National University's free online astrophysics courses:
https://www.edx.org/xseries/astrophysics
It was created using the VPython library (vpython.org)
The timing capabilities and sensitivity of Kepler, NASA's observatory to find Earth-sized planets within the habitable zone of stars, are well matched to the ti...
The timing capabilities and sensitivity of Kepler, NASA's observatory to find Earth-sized planets within the habitable zone of stars, are well matched to the timescales and amplitudes of accretion disk variability in cataclysmic variables. This instrumental combination provides an unprecedented opportunity to test and refine stellar accretion paradigms with high-precision, uniform data, containing none of the diurnal or season gaps that limit ground-based observations. We present a 3-month, 1 minute cadence Kepler light curve of V344 Lyr, a faint, little-studied dwarf nova within the Kepler field. The light curve samples V344 Lyr during five full normal outbursts and one superoutburst. Surprisingly, the superhumps found during superoutburst continue to be detected during the following quiescent state and normal outburst. The fractional excess of superhump period over the presumed orbital period suggests a relatively high binary mass ratio in a system where the radius of the accretion disk must vary by less than 2% in order to maintain tidal precession throughout the extended episode of superhumping. Disk radius is less restricted if the quiescent signal identified tentatively as the orbital period is a negative superhump, generated by a retrograde-precessing accretion disk, tilted with respect to the binary orbital plane.
This video represents a sonification of Kepler SC data from V344 Lyr superhumps observed during Q2. Data were summed into 10-min bins, and these flux values were scaled to musical notes spanning 6 octaves. The light curve shown contains all 23,943 original points
credit: NASA/Kepler Mission/Matt Wood/Martin Still/Steve Howell/John Cannizzo/Alan Smale
source: http://kepler.nasa.gov/multimedia/AnimationsandMore/animations/?ImageID=146
The timing capabilities and sensitivity of Kepler, NASA's observatory to find Earth-sized planets within the habitable zone of stars, are well matched to the timescales and amplitudes of accretion disk variability in cataclysmic variables. This instrumental combination provides an unprecedented opportunity to test and refine stellar accretion paradigms with high-precision, uniform data, containing none of the diurnal or season gaps that limit ground-based observations. We present a 3-month, 1 minute cadence Kepler light curve of V344 Lyr, a faint, little-studied dwarf nova within the Kepler field. The light curve samples V344 Lyr during five full normal outbursts and one superoutburst. Surprisingly, the superhumps found during superoutburst continue to be detected during the following quiescent state and normal outburst. The fractional excess of superhump period over the presumed orbital period suggests a relatively high binary mass ratio in a system where the radius of the accretion disk must vary by less than 2% in order to maintain tidal precession throughout the extended episode of superhumping. Disk radius is less restricted if the quiescent signal identified tentatively as the orbital period is a negative superhump, generated by a retrograde-precessing accretion disk, tilted with respect to the binary orbital plane.
This video represents a sonification of Kepler SC data from V344 Lyr superhumps observed during Q2. Data were summed into 10-min bins, and these flux values were scaled to musical notes spanning 6 octaves. The light curve shown contains all 23,943 original points
credit: NASA/Kepler Mission/Matt Wood/Martin Still/Steve Howell/John Cannizzo/Alan Smale
source: http://kepler.nasa.gov/multimedia/AnimationsandMore/animations/?ImageID=146
This is a high-level research talk designed for professional astronomers. It is part of the Caltech Astronomy Colloquium Series, hour-long presentations given ...
This is a high-level research talk designed for professional astronomers. It is part of the Caltech Astronomy Colloquium Series, hour-long presentations given weekly by top scientists from around the world to the members of our department. All are welcome to watch these colloquium presentations; however, for talks specifically designed for the general public, please see our Caltech Astro Outreach channel: https://youtube.com/c/caltechastro. Timestamps and abstract are included below.
Date: 11/30/22
Speaker: Prof. Paula Szkody, University of Washington
Title: Deciphering accretion in cataclysmic variables
Abstract : The close binaries containing a white dwarf primary and undergoing active accretion that are called Cataclysmic Variables have been known for more than 70 years. While much has been learned about how accretion occurs (and stops) in these systems, there are still many remaining questions that center around their magnetic fields and angular momentum losses. The use of UV and high time resolution continuous coverage from satellites has provided both intriguing data as well as further conundrums. Some recent results will be presented and what is needed for the future.
This is a high-level research talk designed for professional astronomers. It is part of the Caltech Astronomy Colloquium Series, hour-long presentations given weekly by top scientists from around the world to the members of our department. All are welcome to watch these colloquium presentations; however, for talks specifically designed for the general public, please see our Caltech Astro Outreach channel: https://youtube.com/c/caltechastro. Timestamps and abstract are included below.
Date: 11/30/22
Speaker: Prof. Paula Szkody, University of Washington
Title: Deciphering accretion in cataclysmic variables
Abstract : The close binaries containing a white dwarf primary and undergoing active accretion that are called Cataclysmic Variables have been known for more than 70 years. While much has been learned about how accretion occurs (and stops) in these systems, there are still many remaining questions that center around their magnetic fields and angular momentum losses. The use of UV and high time resolution continuous coverage from satellites has provided both intriguing data as well as further conundrums. Some recent results will be presented and what is needed for the future.
Third-year law student Colin Littlefield has observed the cataclysmic variable, CSS 081231:071126+440405, using the Sarah L. Krizmanich Telescope at the Univers...
Third-year law student Colin Littlefield has observed the cataclysmic variable, CSS 081231:071126+440405, using the Sarah L. Krizmanich Telescope at the University of Notre Dame. This video an animation of the star for 13 minutes, which has been sped up to illustrate the eclipse that happens every two hours.
Third-year law student Colin Littlefield has observed the cataclysmic variable, CSS 081231:071126+440405, using the Sarah L. Krizmanich Telescope at the University of Notre Dame. This video an animation of the star for 13 minutes, which has been sped up to illustrate the eclipse that happens every two hours.
A talk given by Jeremy Shears to the Herefordshire Astronomical Society on 22nd June 2020.
Jeremy is Director of the BAA Variable Star Section and a keen obser...
A talk given by Jeremy Shears to the Herefordshire Astronomical Society on 22nd June 2020.
Jeremy is Director of the BAA Variable Star Section and a keen observer of variable stars from his observatory in Cheshire. He frequently collaborates with professional astronomers on research into cataclysmic variables. Jeremy was BAA President from 2015-17 and is currently the Association's Papers Secretary. By day he is Chief Scientist at Shell, focusing on the transition to new energy systems.
Jeremy discusses variable and cataclysmic stars and explains how to observe them.
A talk given by Jeremy Shears to the Herefordshire Astronomical Society on 22nd June 2020.
Jeremy is Director of the BAA Variable Star Section and a keen observer of variable stars from his observatory in Cheshire. He frequently collaborates with professional astronomers on research into cataclysmic variables. Jeremy was BAA President from 2015-17 and is currently the Association's Papers Secretary. By day he is Chief Scientist at Shell, focusing on the transition to new energy systems.
Jeremy discusses variable and cataclysmic stars and explains how to observe them.
Cataclysmic Variables are a broad class of variables that undergo violent nuclear outbursts. These events can quickly drive their brightness up many magnitudes...
Cataclysmic Variables are a broad class of variables that undergo violent nuclear outbursts. These events can quickly drive their brightness up many magnitudes. They include the familiar novae and supernovae, but also include other varietals like dwarf novae, recurrent novae, nova-like variables, polars, intermediate polars and all kinds of variable stars that light off with little or no warning. Most cataclysmic variables are binary star systems where a white dwarf siphons mass from the companion. In the presentation, we’ll discuss how these binary systems that start off as a pair of normal main sequence stars eventually go so horribly awry. We’ll also talk about the work amateur astronomers have done for the AAVSO and for pro-am collaborations like the Center for Backyard Astrophysics that have led to significant advances in the understanding of cataclysmic variables.Speaker Bio – Walt Cooney is a retired chemical engineer who has been an avid amateur astronomer since 4th grade when he did a report on the constellation Orion. He was raised in Titusville, Florida where his dad was an engineer for NASA. He has a B.S.Ch.E from the University of Florida and an M.S. in chemical engineering from Cornell. He is the author or coauthor of 45 papers in astronomical journals, and discoverer of 64 asteroids and 59 variable stars including 3 in Columbus. Asteroid (35365) Cooney was kindly named after Walt by Dr. Petr Pravec of the Ondrejov Observatory in the Czech Republic.
Cataclysmic Variables are a broad class of variables that undergo violent nuclear outbursts. These events can quickly drive their brightness up many magnitudes. They include the familiar novae and supernovae, but also include other varietals like dwarf novae, recurrent novae, nova-like variables, polars, intermediate polars and all kinds of variable stars that light off with little or no warning. Most cataclysmic variables are binary star systems where a white dwarf siphons mass from the companion. In the presentation, we’ll discuss how these binary systems that start off as a pair of normal main sequence stars eventually go so horribly awry. We’ll also talk about the work amateur astronomers have done for the AAVSO and for pro-am collaborations like the Center for Backyard Astrophysics that have led to significant advances in the understanding of cataclysmic variables.Speaker Bio – Walt Cooney is a retired chemical engineer who has been an avid amateur astronomer since 4th grade when he did a report on the constellation Orion. He was raised in Titusville, Florida where his dad was an engineer for NASA. He has a B.S.Ch.E from the University of Florida and an M.S. in chemical engineering from Cornell. He is the author or coauthor of 45 papers in astronomical journals, and discoverer of 64 asteroids and 59 variable stars including 3 in Columbus. Asteroid (35365) Cooney was kindly named after Walt by Dr. Petr Pravec of the Ondrejov Observatory in the Czech Republic.
Cataclysmic variables (CVs) are a type of binary system containing a white dwarf as a primary compact object, accreting material from a late-type main sequence ...
Cataclysmic variables (CVs) are a type of binary system containing a white dwarf as a primary compact object, accreting material from a late-type main sequence secondary star. X-rays are produced by the accretion process in these systems. These are ideal laboratory for studying the geometry of a binary system as well as various physical mechanisms responsible for producing emissions at different energies. I will discuss the X-ray characteristics of these interesting sources and present our recent results on a rare sub-class of CVs, namely, Asynchronous Polars. I will also briefly discuss the importance of X-ray-focusing optics in studying such systems and our efforts to develop technology for hard X-ray optics.
The Raman Research Institute is a premier research Institute founded by Indian Science Nobel Laureate Sir C V Raman. The Institute has a rich heritage and legacy of conducting fundamental research in frontier areas of Physics under contemporary research themes. The Institute was founded in 1948 and entered its platinum jubilee year on 7 November 2022, celebrating it with The Launch Event and an In-House conference, "Showcasing RRI." During the Showcasing RRI week, researchers from all four departments at RRI enlightened the audience with their ongoing research.
#cvraman #platinumjubilee #rri #astronomy #astrophysics #xray #stars #binarystar #whitedwarf
Cataclysmic variables (CVs) are a type of binary system containing a white dwarf as a primary compact object, accreting material from a late-type main sequence secondary star. X-rays are produced by the accretion process in these systems. These are ideal laboratory for studying the geometry of a binary system as well as various physical mechanisms responsible for producing emissions at different energies. I will discuss the X-ray characteristics of these interesting sources and present our recent results on a rare sub-class of CVs, namely, Asynchronous Polars. I will also briefly discuss the importance of X-ray-focusing optics in studying such systems and our efforts to develop technology for hard X-ray optics.
The Raman Research Institute is a premier research Institute founded by Indian Science Nobel Laureate Sir C V Raman. The Institute has a rich heritage and legacy of conducting fundamental research in frontier areas of Physics under contemporary research themes. The Institute was founded in 1948 and entered its platinum jubilee year on 7 November 2022, celebrating it with The Launch Event and an In-House conference, "Showcasing RRI." During the Showcasing RRI week, researchers from all four departments at RRI enlightened the audience with their ongoing research.
#cvraman #platinumjubilee #rri #astronomy #astrophysics #xray #stars #binarystar #whitedwarf
This simulation shows a white-dwarf/Red Giant binary star system. Matter from the red giant is spilling through the Roche lobe onto the white dwarf, via a hot spot and an accretion disk. This is believed to be an accurate representation of a dwarf nova.
This simulation is one of many made during creation of the Australian National University's free online astrophysics courses:
https://www.edx.org/xseries/astrophysics
It was created using the VPython library (vpython.org)
The timing capabilities and sensitivity of Kepler, NASA's observatory to find Earth-sized planets within the habitable zone of stars, are well matched to the timescales and amplitudes of accretion disk variability in cataclysmic variables. This instrumental combination provides an unprecedented opportunity to test and refine stellar accretion paradigms with high-precision, uniform data, containing none of the diurnal or season gaps that limit ground-based observations. We present a 3-month, 1 minute cadence Kepler light curve of V344 Lyr, a faint, little-studied dwarf nova within the Kepler field. The light curve samples V344 Lyr during five full normal outbursts and one superoutburst. Surprisingly, the superhumps found during superoutburst continue to be detected during the following quiescent state and normal outburst. The fractional excess of superhump period over the presumed orbital period suggests a relatively high binary mass ratio in a system where the radius of the accretion disk must vary by less than 2% in order to maintain tidal precession throughout the extended episode of superhumping. Disk radius is less restricted if the quiescent signal identified tentatively as the orbital period is a negative superhump, generated by a retrograde-precessing accretion disk, tilted with respect to the binary orbital plane.
This video represents a sonification of Kepler SC data from V344 Lyr superhumps observed during Q2. Data were summed into 10-min bins, and these flux values were scaled to musical notes spanning 6 octaves. The light curve shown contains all 23,943 original points
credit: NASA/Kepler Mission/Matt Wood/Martin Still/Steve Howell/John Cannizzo/Alan Smale
source: http://kepler.nasa.gov/multimedia/AnimationsandMore/animations/?ImageID=146
This is a high-level research talk designed for professional astronomers. It is part of the Caltech Astronomy Colloquium Series, hour-long presentations given weekly by top scientists from around the world to the members of our department. All are welcome to watch these colloquium presentations; however, for talks specifically designed for the general public, please see our Caltech Astro Outreach channel: https://youtube.com/c/caltechastro. Timestamps and abstract are included below.
Date: 11/30/22
Speaker: Prof. Paula Szkody, University of Washington
Title: Deciphering accretion in cataclysmic variables
Abstract : The close binaries containing a white dwarf primary and undergoing active accretion that are called Cataclysmic Variables have been known for more than 70 years. While much has been learned about how accretion occurs (and stops) in these systems, there are still many remaining questions that center around their magnetic fields and angular momentum losses. The use of UV and high time resolution continuous coverage from satellites has provided both intriguing data as well as further conundrums. Some recent results will be presented and what is needed for the future.
Third-year law student Colin Littlefield has observed the cataclysmic variable, CSS 081231:071126+440405, using the Sarah L. Krizmanich Telescope at the University of Notre Dame. This video an animation of the star for 13 minutes, which has been sped up to illustrate the eclipse that happens every two hours.
A talk given by Jeremy Shears to the Herefordshire Astronomical Society on 22nd June 2020.
Jeremy is Director of the BAA Variable Star Section and a keen observer of variable stars from his observatory in Cheshire. He frequently collaborates with professional astronomers on research into cataclysmic variables. Jeremy was BAA President from 2015-17 and is currently the Association's Papers Secretary. By day he is Chief Scientist at Shell, focusing on the transition to new energy systems.
Jeremy discusses variable and cataclysmic stars and explains how to observe them.
Cataclysmic Variables are a broad class of variables that undergo violent nuclear outbursts. These events can quickly drive their brightness up many magnitudes. They include the familiar novae and supernovae, but also include other varietals like dwarf novae, recurrent novae, nova-like variables, polars, intermediate polars and all kinds of variable stars that light off with little or no warning. Most cataclysmic variables are binary star systems where a white dwarf siphons mass from the companion. In the presentation, we’ll discuss how these binary systems that start off as a pair of normal main sequence stars eventually go so horribly awry. We’ll also talk about the work amateur astronomers have done for the AAVSO and for pro-am collaborations like the Center for Backyard Astrophysics that have led to significant advances in the understanding of cataclysmic variables.Speaker Bio – Walt Cooney is a retired chemical engineer who has been an avid amateur astronomer since 4th grade when he did a report on the constellation Orion. He was raised in Titusville, Florida where his dad was an engineer for NASA. He has a B.S.Ch.E from the University of Florida and an M.S. in chemical engineering from Cornell. He is the author or coauthor of 45 papers in astronomical journals, and discoverer of 64 asteroids and 59 variable stars including 3 in Columbus. Asteroid (35365) Cooney was kindly named after Walt by Dr. Petr Pravec of the Ondrejov Observatory in the Czech Republic.
Cataclysmic variables (CVs) are a type of binary system containing a white dwarf as a primary compact object, accreting material from a late-type main sequence secondary star. X-rays are produced by the accretion process in these systems. These are ideal laboratory for studying the geometry of a binary system as well as various physical mechanisms responsible for producing emissions at different energies. I will discuss the X-ray characteristics of these interesting sources and present our recent results on a rare sub-class of CVs, namely, Asynchronous Polars. I will also briefly discuss the importance of X-ray-focusing optics in studying such systems and our efforts to develop technology for hard X-ray optics.
The Raman Research Institute is a premier research Institute founded by Indian Science Nobel Laureate Sir C V Raman. The Institute has a rich heritage and legacy of conducting fundamental research in frontier areas of Physics under contemporary research themes. The Institute was founded in 1948 and entered its platinum jubilee year on 7 November 2022, celebrating it with The Launch Event and an In-House conference, "Showcasing RRI." During the Showcasing RRI week, researchers from all four departments at RRI enlightened the audience with their ongoing research.
#cvraman #platinumjubilee #rri #astronomy #astrophysics #xray #stars #binarystar #whitedwarf
Cataclysmic variable stars (CV) are stars which irregularly increase in brightness by a large factor, then drop back down to a quiescent state. They were initially called novae, from the Latin 'new', since ones with an outburst brightness visible to the naked eye and an invisible quiescent brightness appeared as new stars in the sky.
Cataclysmic variable stars are binary stars that consist of two components; a white dwarf primary, and a mass transferring secondary. The stars are so close to each other that the gravity of the white dwarf distorts the secondary, and the white dwarf accretes matter from the companion. Therefore, the secondary is often referred to as the donor star. The infalling matter, which is usually rich in hydrogen, forms in most cases an accretion disc around the white dwarf. Strong UV and X-ray emission is often seen from the accretion disc. The accretion disk may be prone to an instability leading to dwarf nova outbursts, when a portion of the disk material falls onto the white dwarf, resulting in release of radiation derived from the loss of gravitational potential energy. The brighter and less frequent nova outbursts occur when the density and temperature at the bottom of the accumulated hydrogen layer rise high enough to ignite runawayhydrogen fusion reactions, which rapidly convert the hydrogen layer to helium.
Cataclysmic variables (CVs) are binary star systems comprising a white dwarf (WD) and a normal star companion ...Polars are a subclass of cataclysmic variables distinguished from other CVs by the ...
Astronomer detects eclipses in a candidate cataclysmic variable system (2024, October 16) retrieved 16 October 2024 from https.//phys.org/news/2024-10-astronomer-eclipses-candidate-cataclysmic-variable.html.
Cataclysmic variables (CVs) are binary star systems consisting of a white dwarf accreting material from a normal star companion ...Polars are a subclass of cataclysmic variables distinguished from other ...
You see, T Cor Bor is a cataclysmic, variable binary star system ... This type of system (a white dwarf slowly consuming a nearby companion star) is what we call a cataclysmic variable ... So what do cataclysmic variables let us study?.
A team of astronomers led by Jenni R ... Based on the obtained results, the authors of the paper suppose that WD1032+011 may be a cataclysmic variable, which is consistent with the properties of the system ... More information. Jenni R ... DOI ... arXiv ... ....
A team of Chinese astronomers has performed photometric observations of a dwarf nova known as Karachurin 12 ... Cataclysmic variables (CVs) are binary star systems consisting of a white dwarf primary that is accreting matter from a normal star companion.
Cataclysmic variables (CVs) are binary star ... New cataclysmic variable system discovered (2024, September 3) retrieved 3 September 2024 from https.//phys.org/news/2024-09-cataclysmic-variable.html.
A citizen science project, which invites members of the public to take part in identifying cosmic explosions, has already identified 20 new astronomical discoveries ... Dr ... The other discovery that has been classified is a cataclysmic variable star ... Dr ... Dr.
The scientists add that LAMOST J2354 will almost certainly experience another phase of mass-transfer in the future when the K dwarf evolves off of the main sequence, resulting in stable mass-transfer and the formation of a cataclysmic variable ...M. A.
This finding strongly suggests that the object is a polar-type cataclysmic variable ... New cataclysmic variable discovered by astronomers (2024, March 29) retrieved 29 March 2024 from https.//phys.org/news/2024-03-cataclysmic-variable-astronomers.html.
Astronomers investigate the properties of a peculiar cataclysmic variable (2024, January 22) retrieved 22 January 2024 from https.//phys.org/news/2024-01-astronomers-properties-peculiar-cataclysmic-variable.html.
New cataclysmic variable discovered that may contain a brown dwarf secondary (2024, January 16) retrieved 16 January 2024 from https.//phys.org/news/2024-01-cataclysmic-variable-brown-dwarf-secondary.html.
... developments to emerge from the Franco-Prussian War on their own historical terms, and not just as explanatory variables in regard to the more closely studied European cataclysms that followed.
The objects turned out to be eclipsing accreting ultracompact white dwarf binaries ... This suggests that it is a helium cataclysmic variable (CV) instead of a typical long-period AM CVn like the other three systems ... More information. J. M ...DOI ... arXiv ... ....
... a cataclysmic variable ... TESS detects new cataclysmic variable system of a rare type (2023, November 9) retrieved 9 November 2023 from https.//phys.org/news/2023-11-tess-cataclysmic-variable-rare.html.
