BE Camelopardalis

BE Camelopardalis is a solitary[9] 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.[2] The star is located roughly 800 light years away from the Sun based on stellar parallax.[1]

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

This object is an M-type bright giant with a stellar classification of M2 II,[5] 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.[3] Having exhausted the supply of hydrogen at its core, the star has expanded to around 176[7] times the Sun's radius. It has 2.9[6] 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.[7]

References
  1. 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.
  2. 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.
  3. Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S.
  4. 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.
  5. 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.
  6. 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.
  7. 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: 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd.
  8. "BE Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-12.
  9. 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.
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