Astronomy:6 Hydrae
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Hydra[1] |
| Right ascension | 08h 40m 01.47182s[2] |
| Declination | −12° 28′ 31.3433″[2] |
| Apparent magnitude (V) | 4.98[1] |
| Characteristics | |
| Evolutionary stage | red giant branch[3] |
| Spectral type | K3 III[4] |
| B−V color index | 1.415±0.001[1] |
| Astrometry | |
| Radial velocity (Rv) | −7.8±0.6[5] km/s |
| Proper motion (μ) | RA: −81.619[2] mas/yr Dec.: −1.646[2] mas/yr |
| Parallax (π) | 8.7394 ± 0.1769[2] mas |
| Distance | 373 ± 8 ly (114 ± 2 pc) |
| Absolute magnitude (MV) | −0.40[1] |
| Details | |
| Radius | 32.7+0.5 −2.6[2] R☉ |
| Luminosity | 267±6[2] L☉ |
| Surface gravity (log g) | 1.91[6] cgs |
| Temperature | 4,080+173 −30[2] K |
| Metallicity [Fe/H] | −0.21[6] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
6 Hydrae is a single[8] star in the equatorial constellation of Hydra, located 373 light-years away from the Sun.[2] 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.[1] It is moving closer to the Earth with a heliocentric radial velocity of −8 km/s.[5] Eggen (1995) listed it as a proper motion candidate for membership in the IC 2391 supercluster.[9]
This is an aging giant star with a stellar classification of K3 III,[4] 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[2] times the radius of the Sun. The star is radiating 267[2] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,080 K.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ McWilliam, Andrew (1990). "High-Resolution Spectroscopic Survey of 671 GK Giants. I. Stellar Atmosphere Parameters and Abundances". The Astrophysical Journal Supplement Series 74: 1075. doi:10.1086/191527. Bibcode: 1990ApJS...74.1075M.
- ↑ 4.0 4.1 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H.
- ↑ 5.0 5.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 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, doi:10.1086/191527, Bibcode: 1990ApJS...74.1075M.
- ↑ "6 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=6+Hya.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Eggen, Olin J. (December 1995), "Reality Tests of Superclusters in the Young Disk Population", Astronomical Journal 110: 2862, doi:10.1086/117734, Bibcode: 1995AJ....110.2862E.
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