HD 37811
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 05h 39m 49.8397s[1] |
| Declination | −32° 37′ 45.1772″[1] |
| Apparent magnitude (V) | 5.44±0.01[2] |
| Characteristics | |
| Evolutionary stage | RGB[3] |
| Spectral type | G6/8 III[4] |
| B−V color index | +0.92[5] |
| Astrometry | |
| Radial velocity (Rv) | −8.3±2[6] km/s |
| Proper motion (μ) | RA: −16.691 mas/yr[1] Dec.: −31.588 mas/yr[1] |
| Parallax (π) | 8.5366 ± 0.0492 mas[1] |
| Distance | 382 ± 2 ly (117.1 ± 0.7 pc) |
| Absolute magnitude (MV) | +0.14[7] |
| Details[7] | |
| Mass | 3.0±0.1 M☉ |
| Radius | 11.68±0.20 R☉ |
| Luminosity | 86±2 L☉ |
| Surface gravity (log g) | 2.81±0.08 cgs |
| Temperature | 5,139±34 K |
| Metallicity [Fe/H] | 0.01±0.03 dex |
| Rotational velocity (v sin i) | 2.4±1.1[8] km/s |
| Age | 440[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 37811 (HR 1958) is a solitary[12] star in the southern constellation Columba. It has an apparent magnitude of 5.44,[2] allowing it to be faintly seen with the naked eye. Parallax measurements place the object at a distance of 382 light years[1] and it is currently approaching with a heliocentric radial velocity of −8.3 km/s.[6]
HD 37811 has a stellar classification of G6/8 III[4] — intermediate between a G6 and G8 giant star that is currently on the red giant branch.[3] It has 3 times the mass of the Sun[7] but has expanded to 11.7 times its girth[7] at an age of 440 million years.[9] It shines with a luminosity of 86 L☉[7] from its enlarged photosphere at an effective temperature of 5,139 K,[7] giving a yellow glow. HD 37811 has a solar metallicity[7] and spins leisurely with a projected rotational velocity of about 2.4 km/s.[8]
References
[edit]- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ a b Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. (December 2011). "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets: I. Sample definition and physical properties⋆⋆⋆". Astronomy & Astrophysics. 536: A71. arXiv:1110.6459. Bibcode:2011A&A...536A..71J. doi:10.1051/0004-6361/201117887. ISSN 0004-6361.
- ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode:1982mcts.book.....H.
- ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
- ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
- ^ a b c d e f g Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. ISSN 0004-6361.
- ^ a b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
- ^ a b Dotter, Aaron; Chaboyer, Brian; Jevremović, Darko; Kostov, Veselin; Baron, E.; Ferguson, Jason W. (September 2008). "The Dartmouth Stellar Evolution Database". The Astrophysical Journal Supplement Series. 178 (1): 89–101. arXiv:0804.4473. Bibcode:2008ApJS..178...89D. doi:10.1086/589654. eISSN 1538-4365. ISSN 0067-0049.
- ^ "HR 2411". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 15, 2022.
- ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
- ^ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711.
