6 Geminorum

6 Geminorum
Location of 6 Geminorum (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Gemini
Right ascension 06h 12m 19.09863s[1]
Declination +22° 54′ 30.6424″[1]
Apparent magnitude (V) 5.74 - 8.10[2]
Characteristics
Spectral type M1-2Ia-Iab[2]
U−B color index +1.93[3]
B−V color index +1.63[3]
Variable type LC[2]
Astrometry
Radial velocity (Rv)27.16 km/s
Proper motion (μ) RA: -0.40[1] mas/yr
Dec.: -3.12[1] mas/yr
Parallax (π)-0.52 ± 0.69 mas
Absolute magnitude (MV)-6.32[4]
Details
Mass~20[5] M☉
Radius670[4] R☉
Luminosity86,000[6] L☉
Surface gravity (log g)0.0[4] cgs
Temperature3,789[7] K
Other designations
6 Gem, BU Gem, HR 2197, BD+22° 1220, HD 42543, HIP 29450, SAO 78098, GC 7896, TYC 1877-1719-1, 2MASS J06121911+2254305
Database references
SIMBADdata

6 Geminorum, also designated BU Geminorum (abbrev: BU Gem), is a red supergiant, located in the constellation Gemini. BU Geminorum is a semiregular variable star, found southwest of M 35, below WY Geminorum, with magnitudes +5.7 to +7.5 v over a period of 325 days. At its brightest the star is barely visible to the naked eye but visible with binoculars. It has been given the sub-classification of Lc "Irregular variable supergiants of late spectral types having amplitudes of about 1 mag. in V.O".[8]

References

  1. 1 2 3 4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 3 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  3. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. Bibcode:1986EgUBV........0M.
  4. 1 2 3 Levesque, Emily M. (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.
  5. ↑ "6 GEM". 2012. Retrieved 15 December 2016.
  6. ↑ Mauron, N; Josselin, E (2011). "The mass-loss rates of red supergiants and the de Jager prescription". Astronomy and Astrophysics. 526: A156. arXiv:1010.5369. Bibcode:2011A&A...526A.156M. doi:10.1051/0004-6361/201013993.
  7. ↑ Mármol-Queraltó, E; Cardiel, N; Cenarro, A. J; Vazdekis, A; Gorgas, J; Pedraz, S; Peletier, R. F; Sánchez-Blázquez, P (2008). "A new stellar library in the region of the CO index at 2.3 μm. New index definition and empirical fitting functions". Astronomy and Astrophysics. 489 (2): 885–909. arXiv:0806.0581. Bibcode:2008A&A...489..885M. doi:10.1051/0004-6361:200810044.
  8. ↑ Variable Star Type Designations in VSX- Retrieved 2016-11-06


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