6_Geminorum

6 Geminorum

6 Geminorum

Red supergiant star in the constellation Gemini

6 Geminorum is a variable star in the zodiac constellation of Gemini, located roughly 5,800 light years away from the Sun. It has the variable star designation BU Geminorum; 6 Geminorum is the Flamsteed designation. At its brightest this reddish hued star is barely visible to the naked eye but is readily visible with binoculars, found southeast of M 35, just to the south of WY Geminorum. It is moving further from the Earth with a heliocentric radial velocity of +27 km/s.[5] The star is a member of the Gemini OB1 association.[12]

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...

This is an evolved red supergiant with a stellar classification of M1-2 Ia-Iab.[3] It is a semiregular variable star, ranging from visual magnitude +5.7 down to +7.5 over a period of 325 days. It has been given the sub-classification of Lc, which means "Irregular variable supergiants of late spectral types having amplitudes of about 1 mag. in V.O".[13] The star has expanded to 821[8] times the Sun's radius and is radiating 86,000[9] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,789 K.[10]

References

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    Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
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    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. [3]
    Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
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    Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. [5]
    Famaey, B.; et al. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430 (1): 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
  6. [6]
    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. S2CID 15109583.
  7. [7]
    "6 GEM". 2012. Retrieved 15 December 2016.
  8. [8]
    Norris, Ryan P. (2019). Seeing Stars Like Never Before: A Long-term Interferometric Imaging Survey of Red Supergiants (PDF) (PhD). Georgia State University.
  9. [9]
    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. S2CID 119276502.
  10. [10]
    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. S2CID 15411613.
  11. [11]
    "6 Gem". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-24.
  12. [12]
    Laur, Jaan; et al. (February 2017). "Variability survey of brightest stars in selected OB associations". Astronomy & Astrophysics. 598: 27. arXiv:1611.02452. Bibcode:2017A&A...598A.108L. doi:10.1051/0004-6361/201629395. S2CID 119076598. A108.
  13. [13]
    "Variable Star Type Designations in VSX]". Retrieved 2016-11-06.
  14. [14]
    "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
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