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The region ionised by O8 V star CD -38 11636 only
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{{ Emission nebula |
{{Infobox nebula
| image = [[File:RCW 120.jpg|250px]]
| image = [[File:RCW 120.jpg|250px]]
| name = RCW 120
| name = RCW 120
| type = [[emission nebula]]
| type = H II REGION
| epoch =
| epoch = [[J2000]]
| ra = {{RA|17|12|23.2}}
| ra = {{RA|17|12|23.2}}
| dec = {{DEC|-38|26|51.2}}
| dec = {{DEC|-38|26|51.2}}
| dist_ly =4,500 ly
| dist_ly =4,300
| appmag_v =
| appmag_v =
| size_v =
| size_v =
| constellation = Scorpius
| constellation = [[Scorpius (constellation)|Scorpius]]
| radius_ly =
| radius_ly =
| absmag_v =
| absmag_v =
| notes =
| notes =
⚫
| names =GUM 58<br />Sh 2-3<br />Green Ring Nebula
}}
'''RCW 120''' is an [[emission nebula]] and [[H II region]] in the southern Milky Way and located some 4,300 light-years from [[Earth]].<ref name=bbc06052010>{{cite news|title= BBC News : Herschel space telescope pierces giant star bubble|url=http://news.bbc.co.uk/2/hi/science/nature/8664318.stm|accessdate=26 February 2017}}</ref>


Its designation appears in the [[RCW Catalogue]] published in 1960, whose circular diameter size is 6 arcmin.<ref name=RCW1960>{{Citation
⚫
| names =GUM 58<br />Sh 2-3<br />Green Ring Nebula}}
|last1=Rodgers
|first1=A. W.
|last2=Campbell
|first2=C. T.
|last3=Whiteoak
|first3=J. B.
|title=A catalogue of Hα-emission regions in the southern Milky Way
|journal=[[Monthly Notices of the Royal Astronomical Society]]
|volume=121
|issue=1
|date=1960
|pages=103–110
|ref=rcw1960
|bibcode = 1960MNRAS.121..103R
|doi=10.1093/mnras/121.1.103|doi-access=free
}}</ref> It also catalogued as [[Sharpless catalog|Sh 2-3]] and [[Gum catalog|Gum 58]].


⚫
Veta S. Avedisova considers RCW 120 is being ionised by the O8 V star CD -38 11636<ref>{{cite web | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%402344615&Name=CD-38%2011636 | title=SIMBAD query result }}</ref> and places the nebula in the star formation region SFR 348.26+0.47<ref>{{cite web | url=http://galaxymap.org/avedisova/html/2932.html | title=Star Formation Region Avedisova 2932 &#124; Galaxy Map }}</ref> along with 3 [[Astrophysical maser]] CH87 347.386+0.266.
'''RCW 120''' is an [[H II region|H II]] emission nebula in the southern Milky Way and located some 4,300 light-years from Earth.
<ref>[http://news.bbc.co.uk/2/hi/science/nature/8664318.stm BBC News]</ref><ref>[http://galaxymap.org/cgi-bin/rcw.py?s=111 Galaxy Map]</ref> Also known as [[Sharpless catalog|Sh 2-3]] and [[Gum catalog|Gum 58]], it is situated at co-ordinates [[Right ascension|348.25°]], [[Declination|0.49°]].


⚫
The [[Herschel Space Observatory|Herschel infra-red telescope]]'s image shows an embryonic star that is likely to become one of the brightest stars in our Galaxy at some time within the next few hundred thousand years. The star now appears about ten times more massive than the Sun and may grow much larger by [[Accretion (astrophysics)|accreting]] material from the surrounding gas and dust.<ref name=codex19052010>{{cite web|title=Science Codex: RCW 120 and the hidden side of star birth|date=19 May 2010 |url=http://www.sciencecodex.com/rcw_120_and_the_hidden_side_of_star_birth |accessdate=26 February 2017}}</ref>
⚫
[[Veta S. Avedisova]] states that RCW 120 is ionised by the O8 V star [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%402344615&Name=CD-38%2011636 CD -38 11636] and the B2 V star [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%402330221&Name=VdBH%2084%20B VDBH 84B], and places the nebula in the star formation region [http://galaxymap.org/avedisova/html/2932.html SFR 348.26+0.47] along with 3 [[masers]] and the radio [[HII region]] CH87 347.386+0.266.


==Gallery==
⚫
The [[Herschel Space Observatory|Herschel infra-red telescope]]'s image shows an embryonic star not yet sparked by fusion (white blob at the lowest point of the blue ring) which is likely to become one of the brightest stars in our Galaxy at some time within the next few hundred thousand years. It is already about ten times more massive than the Sun and is set to grow much larger by [[Accretion (astrophysics)|accreting]] surrounding gas and dust. Current theories of star formation cannot explain star masses greater than about 10 times that of the Sun, even though stars having a mass of 120 Suns are known.
<gallery heights="200px" mode="packed">
<ref>[http://www.sciencecodex.com/rcw_120_and_the_hidden_side_of_star_birth Science Codex]</ref>
File:Iotw2230a A Crimson Nursery.jpg|{{center|RCW 120, also known as Sharpless 2-3 was captured by the SMARTS 0.9-meter Telescope at [[Cerro Tololo Inter-American Observatory]] }}<ref>{{cite news|title=A Crimson Nursery|url=https://noirlab.edu/public/images/iotw2230a/|access-date=16 December 2022}}</ref>

</gallery>
The [[RCW Catalogue]], first published in 1960, is named after Alexander William '''R'''odgers, Colin T. '''C'''ampbell and John Bolton '''W'''hiteoak, who led by [[Bart Bok]], catalogued southern nebulae while working at the [[Mount Stromlo Observatory]] in Australia.


==External links==
==External links==
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==References==
==References==
{{reflist}}
{{Reflist}}


{{RCW}}
{{Sh2 objects}}
{{Sh2 objects}}


{{DEFAULTSORT:Rcw 120}}
{{DEFAULTSORT:Rcw 120}}
[[Category:Emission nebulae]]
[[Category:H II regions]]
[[Category:H II regions]]
[[Category:Sharpless objects|3]]
[[Category:Sharpless objects]]
[[Category:Star-forming regions]]

[[it:RCW 120]]
[[Category:Scorpius]]
[[pl:RCW 120]]
[[tr:RCW 120]]

Latest revision as of 14:57, 29 May 2023

RCW 120
Emission nebula
H II region
Observation data: J2000 epoch
Right ascension17h 12m 23.2s
Declination−38° 26′ 51.2″
Distance4,300 ly
ConstellationScorpius
DesignationsGUM 58
Sh 2-3
Green Ring Nebula
See also: Lists of nebulae

RCW 120 is an emission nebula and H II region in the southern Milky Way and located some 4,300 light-years from Earth.[1]

Its designation appears in the RCW Catalogue published in 1960, whose circular diameter size is 6 arcmin.[2] It also catalogued as Sh 2-3 and Gum 58.

Veta S. Avedisova considers RCW 120 is being ionised by the O8 V star CD -38 11636[3] and places the nebula in the star formation region SFR 348.26+0.47[4] along with 3 Astrophysical maser CH87 347.386+0.266.

The Herschel infra-red telescope's image shows an embryonic star that is likely to become one of the brightest stars in our Galaxy at some time within the next few hundred thousand years. The star now appears about ten times more massive than the Sun and may grow much larger by accreting material from the surrounding gas and dust.[5]

[edit]
[edit]

References

[edit]
  1. ^ "BBC News : Herschel space telescope pierces giant star bubble". Retrieved 26 February 2017.
  2. ^ Rodgers, A. W.; Campbell, C. T.; Whiteoak, J. B. (1960), "A catalogue of Hα-emission regions in the southern Milky Way", Monthly Notices of the Royal Astronomical Society, 121 (1): 103–110, Bibcode:1960MNRAS.121..103R, doi:10.1093/mnras/121.1.103
  3. ^ "SIMBAD query result".
  4. ^ "Star Formation Region Avedisova 2932 | Galaxy Map".
  5. ^ "Science Codex: RCW 120 and the hidden side of star birth". 19 May 2010. Retrieved 26 February 2017.
  6. ^ "A Crimson Nursery". Retrieved 16 December 2022.
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