Red giant star in the constellation Cancer
21 Cancri is a double star in the northern zodiac constellation of Cancer . It is just visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 6.08. The star is located around 791 light years away from the Sun, based on parallax . It is moving further from the Earth with a heliocentric radial velocity of 35 km/s.
The brighter component is an aging red giant with a stellar classification of M2III. It is currently on the asymptotic giant branch , indicating this is a highly evolved star that has exhausted both its core hydrogen and core helium. This is a suspected variable star . It has expanded to 53 times the radius of the Sun and is radiating 587 times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,885 K. A 9th magnitude companion star is located one arc second away.
References
^ 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 .
^ Ducati, J. R. (2002). "VizieR On-line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR On-line Data Catalog . 2237 . Bibcode :2002yCat.2237....0D .
^ Abt, H. A. (1985). "Visual multiples. VIII. 1000 MK types" . The Astrophysical Journal Supplement Series . 59 : 95. Bibcode :1985ApJS...59...95A . doi :10.1086/191064 .
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 . S2CID 119257644 .
^ 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 : B/GCVS. Bibcode :2009yCat....102025S .
^ 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 .
^ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal . 104 : 275. Bibcode :1992AJ....104..275E . doi :10.1086/116239 .
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