Astronomy:BE Camelopardalis

From HandWiki
Short description: Variable star in the Camelopardalis constellation
BE Camelopardalis
Location of BE Camelopardalis (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis
Right ascension  03h 49m 31.27755s[1]
Declination +65° 31′ 33.5258″[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: +0.319[1] mas/yr
Dec.: −15.593[1] mas/yr
Parallax (π)3.3288 ± 0.1874[1] mas
Distance958+53
−51 ly
(293.7+16.4
−15.5 pc)
Absolute magnitude (MV)−2.51[2]
Details
Mass2.93[6] M☉
Radius250[7] R☉
Luminosity10,600[7] L☉
Temperature3,660[7] K
Other designations
Custos, BE Cam, BD+65°369, HD 23475, HIP 17884, HR 1155, SAO 12916[8]
Database references
SIMBADdata

BE Camelopardalis, also named Custos,[9] 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.[2] The star is located roughly 960 light years away.[11]

A light curve for BE Camelopardalis, plotted from Hipparcos data[12]

This object is an M-type bright giant with a stellar classification of M2 II,[5] 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.[13] It was given its variable star designation, BE Camelopardalis, in 1977.[14] 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 250[7] times the Sun's radius. It has 2.9[6] 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.[7]

This star was part of the now-obsolete constellation Custos Messium, the Harvest Keeper, which was named as a pun on Charles Messier. The IAU Working Group on Star Names approved the name Custos for this star on 25 December 2025, after the obsolete constellation, and it is now so entered in the IAU Catalog of Star Names.[9] The brightest star of Custos Messium, 50 Cassiopeiae,[15] was given the proper name Gang after a Chinese constellation.[9]

References

  1. ↑ 1.0 1.1 1.2 1.3 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.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 3.2 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. 
  4. ↑ 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. 
  5. ↑ 5.0 5.1 "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. 
  6. ↑ 6.0 6.1 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. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 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. 
  8. ↑ "BE Cam". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BE+Cam. 
  9. ↑ 9.0 9.1 9.2 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 
  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. ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access. 
  13. ↑ 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. 
  14. ↑ 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. 
  15. ↑ Ridpath, Ian. "Star Tales – Custos Messium". http://www.ianridpath.com/startales/custosmessium.html. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:BE_Camelopardalis&oldid=4215850"