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BE Camelopardalis is a solitary[10] variable star in the northern circumpolar constellation of Camelopardalis. It is visible to the naked eye as a faint, red-hued point of light with an apparent visual magnitude that fluctuates around 4.39.[3] The star is located roughly 800 light years away from the Sun based on stellar parallax.[2]

BE Camelopardalis

A light curve for BE Camelopardalis, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 03h 49m 31.27742s[2]
Declination +65° 31′ 33.5567″[2]
Apparent magnitude (V) 4.39[3] (4.35 - 4.48)[4]
Characteristics
Evolutionary stage asymptotic giant branch[5]
Spectral type M2 II[6]
B−V color index 1.870±0.029[3]
Variable type Lc[4]
Astrometry
Radial velocity (Rv)−1.70±1.47[3] km/s
Proper motion (μ) RA: +0.304[2] mas/yr
Dec.: −17.482[2] mas/yr
Parallax (π)4.10 ± 0.46 mas[2]
Distanceapprox. 800 ly
(approx. 240 pc)
Absolute magnitude (MV)−2.51[3]
Details
Mass2.93[7] M☉
Radius176[8] R☉
Luminosity4,613 - 4,786[8] L☉
Temperature3,615±170[8] K
Other designations
BE Cam, BD+65°369, HD 23475, HIP 17884, HR 1155, SAO 12916[9]
Database references
SIMBADdata

This object is an M-type bright giant with a stellar classification of M2 II,[6] and is currently on the asymptotic giant branch. It is classified as an irregular variable of subtype Lc and its brightness varies from magnitude +4.35 down to +4.48.[4] Having exhausted the supply of hydrogen at its core, the star has expanded to around 176[8] times the Sun's radius. It has 2.9[7] times the Sun's mass and is radiating over four thousand times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,615 K.[8]


References


  1. "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. 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. Gaia DR2 record for this source at VizieR.
  3. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  4. Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  5. Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". Astronomical Journal. 104 (1): 275–313. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
  6. Levesque, Emily M.; et al. (August 2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal. 628 (2): 973–985. arXiv:astro-ph/0504337. Bibcode:2005ApJ...628..973L. doi:10.1086/430901. S2CID 15109583.
  7. Hohle, M. M.; et al. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID 111387483.
  8. Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. S2CID 148571616.
  9. "BE Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-12.
  10. Eggleton, P. P.; Tokovinin, A. A. (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. S2CID 14878976.

На других языках

[de] BE Camelopardalis

BE Camelopardalis (kurz BE Cam) ist ein dem bloßen Auge als lichtschwach erscheinender veränderlicher Stern im nördlichen, zirkumpolaren Sternbild Giraffe (lateinisch Camelopardalis). Seine mittlere scheinbare Helligkeit beträgt 4,39m. Nach im Dezember 2020 veröffentlichten Auswertungen der Messergebnisse der Raumsonde Gaia ist der Stern etwa 980 Lichtjahre von der Erde entfernt.[1]
- [en] BE Camelopardalis


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