Astronomy:BE Camelopardalis

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Short description: Variable star in the Camelopardalis constellation
BE Camelopardalis
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A light curve for BE Camelopardalis, plotted from Hipparcos data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis
Right ascension  03h 49m 31.27755s[2]
Declination +65° 31′ 33.5258″[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: +0.319[2] mas/yr
Dec.: −15.593[2] mas/yr
Parallax (π)3.3288 ± 0.1874[2] mas
Distance958+53
−51 ly
(293.7+16.4
−15.5 pc)
Absolute magnitude (MV)−2.51[3]
Details
Mass2.93[7] M☉
Radius250[8] R☉
Luminosity10,600[8] L☉
Temperature3,660[8] K
Other designations
BE Cam, BD+65°369, HD 23475, HIP 17884, HR 1155, SAO 12916[9]
Database references
SIMBADdata

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 960 light years away.[11]

This object is an M-type bright giant with a stellar classification of M2 II,[6] and is currently on the asymptotic giant branch. In 1928, Joel Stebbins and Charles Morse Huffer announced that the star, then called HR 1155, is a variable star, based on observations made at Washburn Observatory.[12] It was given its variable star designation, BE Camelopardalis, in 1977.[13] 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 250[8] times the Sun's radius. It has 2.9[7] times the Sun's mass and is radiating over 10,000 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,660 K.[8]

References

  1. ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access. 
  2. ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  4. ↑ 4.0 4.1 4.2 Samus, N. N. et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  5. ↑ Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". Astronomical Journal 104 (1): 275–313. doi:10.1086/116239. Bibcode: 1992AJ....104..275E. 
  6. ↑ 6.0 6.1 "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal 628 (2): 973–985. August 2005. doi:10.1086/430901. Bibcode: 2005ApJ...628..973L. 
  7. ↑ 7.0 7.1 Hohle, M. M. et al. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten 331 (4): 349. doi:10.1002/asna.200911355. Bibcode: 2010AN....331..349H. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 Healy, Sarah; Horiuchi, Shunsaku; Molla, Marta Colomer; Milisavljevic, Dan; Tseng, Jeff; Bergin, Faith; Weil, Kathryn; Tanaka, Masaomi (2024-03-23). "Red Supergiant Candidates for Multimessenger Monitoring of the Next Galactic Supernova". Monthly Notices of the Royal Astronomical Society 529 (4): 3630–3650. doi:10.1093/mnras/stae738. ISSN 0035-8711. Bibcode: 2024MNRAS.529.3630H. 
  9. ↑ "BE Cam". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BE+Cam. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  11. ↑ Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal 161 (3): 147. doi:10.3847/1538-3881/abd806. ISSN 0004-6256. Bibcode: 2021AJ....161..147B.  Data about this star can be seen here.
  12. ↑ Stebbins, Joel; Huffer, C. M. (1928). "The Constancy of the Light of Red Stars". Publications of the Washburn Observatory 15: 137–174. Bibcode: 1928PWasO..15..137S. https://articles.adsabs.harvard.edu/pdf/1928PWasO..15..137S. Retrieved 5 December 2024. 
  13. ↑ Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (March 1977). "62nd Name-List of Variable Stars". Information Bulletin on Variable Stars 1248: 1. Bibcode: 1977IBVS.1248....1K. https://ibvs.konkoly.hu/pub/ibvs/1201/1248.pdf. Retrieved 29 December 2024. 



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