6 Hydrae
Star in the constellation Hydra
6 Hydrae is a single[ 7] star in the equatorial constellation of Hydra ,[ 6] located 373 light-years away from the Sun .[ 1] It has the Bayer designation a Hydrae ; 6 Hydrae is the Flamsteed designation . This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.98.[ 2] It is moving closer to the Earth with a heliocentric radial velocity of −8 km/s.[ 4] Eggen (1995) listed it as a proper motion candidate for membership in the IC 2391 supercluster .[ 8]
This is an aging giant star with a stellar classification of K3 III,[ 3] which indicates it has exhausted the hydrogen at its core and evolved away from the main sequence . As a consequence, it has expanded to 33[ 1] times the radius of the Sun . The star is radiating 267[ 1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,080 K .[ 1]
References
^ a b c d e f g h i j k l 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 .
^ a b c d 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 .
^ a b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode :1988mcts.book.....H .
^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics , 546 : 14, arXiv :1208.3048 , Bibcode :2012A&A...546A..61D , doi :10.1051/0004-6361/201219219 , S2CID 59451347 , A61.
^ a b McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series , 74 : 1075–1128, Bibcode :1990ApJS...74.1075M , doi :10.1086/191527 .
^ a b "6 Hya" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-04-23 .
^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 .
^ Eggen, Olin J. (December 1995), "Reality Tests of Superclusters in the Young Disk Population", Astronomical Journal , 110 : 2862, Bibcode :1995AJ....110.2862E , doi :10.1086/117734 .