astro.wikisort.org - Star31 Comae Berenices (31 Com) is a yellow giant star in the constellation Coma Berenices. Its apparent magnitude is about 4.9 and slightly variable. It is a rare FK Comae Berenices variable, a variable star that spins rapidly and has large starspots on its surface.[5] It is currently in the Hertzsprung gap and its outer envelope has just begun convection.[3] In 1989 it was given as a spectral standard for the class G0IIIp.[6]
Star in the constellation Coma Berenices
31 Comae Berenices
Observation data Epoch J2000 Equinox J2000 |
Constellation |
Coma Berenices |
Right ascension |
12h 51m 41.91900s[1] |
Declination |
+27° 32′ 26.5683″[1] |
Apparent magnitude (V) |
4.87 - 4.97[2] |
Characteristics |
Evolutionary stage |
Hertzsprung gap[3] |
Spectral type |
G0III[4] |
Variable type |
FK Com[2] |
Astrometry |
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Proper motion (μ) | RA: −10.990[1] mas/yr Dec.: −8.313[1] mas/yr |
Parallax (π) | 11.4933 ± 0.1828 mas[1] |
Distance | 284 ± 5 ly (87 ± 1 pc) |
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Details[4] |
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Radius | 8.9 R☉ |
Luminosity | 74 L☉ |
Surface gravity (log g) | 3.51 cgs |
Temperature | 5,660 K |
Metallicity [Fe/H] | −0.15 dex |
Rotation | 6.8 d |
Rotational velocity (v sin i) | 67 km/s |
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Other designations |
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Database references |
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SIMBAD | data |
31 Com is the north galactic pole star, and occasionally goes by the informal name Polaris Galacticum Borealis, coined by Jim Kaler.[7]
In Chinese astronomy, 31 Comae Berenices is called 郎將, Pinyin: Lángjiāng, meaning Captain of the Bodyguards, because this star is marking itself and stand alone in Captain of the Bodyguards asterism, Supreme Palace enclosure mansion (see : Chinese constellation).[8]
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
- Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- Strassmeier, K. G.; et al. (September 2010), "Rotation and magnetic activity of the Hertzsprung-gap giant 31 Comae", Astronomy and Astrophysics, 520: 14, Bibcode:2010A&A...520A..52S, doi:10.1051/0004-6361/201015023, A52.
- Aurière, M.; et al. (February 2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics, 574: 30, arXiv:1411.6230, Bibcode:2015A&A...574A..90A, doi:10.1051/0004-6361/201424579, S2CID 118504829, A90.
- "31 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 13, 2018.
- Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins Catalog of Revised MK Types for the Cooler Stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373
- "Polaris Galacticum Borealis". Retrieved 2015-12-02.
- Ian Ridpath's Startales - Coma Berenices the Berenice's Hair
Constellation of Coma Berenices |
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На других языках
- [en] 31 Comae Berenices
[es] 31 Comae Berenices
31 Comae Berenices (31 Com / HD 111812 / HR 4883) es una estrella de la constelación de Cabellera de Berenice que se encuentra a 307 años luz de distancia del Sistema Solar. Su ubicación en el cielo nocturno marca la posición del polo norte galáctico, donde la cantidad de polvo interestelar es menor, lo que permite ver una gran cantidad de objetos del espacio profundo.
[ru] 31 Волос Вероники
31 Волос Вероники (лат. 31 Comae Berenices), LS Волос Вероники (лат. LS Comae Berenices), HD 111812 — двойная звезда в созвездии Волосы Вероники на расстоянии приблизительно 284 световых лет (около 87 парсеков) от Солнца. Видимая звёздная величина звезды — от +4,97m до +4,87m[12]. Возраст звезды определён как около 560 млн лет[13].
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