51 Hydrae

This article will address the topic of 51 Hydrae, which is of great relevance today. 51 Hydrae is a topic that has generated great interest in various areas, from politics to science, through culture and society in general. Throughout history, 51 Hydrae has been the subject of study and debate, raising conflicting opinions and provoking deep reflections on its impact on everyday life. In this sense, it is essential to analyze in detail the different aspects related to 51 Hydrae, addressing its implications and consequences, as well as the possible solutions that may arise as a result of its presence. Therefore, the main objective of this article is to provide a broad and updated view of 51 Hydrae, in order to promote critical and constructive reflection on this very relevant topic.
This article is about k Hydrae. Not to be confused with κ (kappa) Hydrae.
51 Hydrae
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 14h 23m 05.77393s[1]
Declination −27° 45′ 14.4609″[1]
Apparent magnitude (V) 4.78[2]
Characteristics
Evolutionary stage giant
Spectral type K4 III[3]
B−V color index 1.300±0.040[2]
Astrometry
Radial velocity (Rv)19.7±0.9[2] km/s
Proper motion (μ) RA: −202.476[1] mas/yr
Dec.: −117.186[1] mas/yr
Parallax (π)19.2042 ± 0.2252 mas[1]
Distance170 ± 2 ly
(52.1 ± 0.6 pc)
Absolute magnitude (MV)1.36[2]
Details
Mass1.31[4] M☉
Radius13.47+0.48
−1.26[1] R☉
Luminosity54.9+0.8
−1.5[1] L☉
Surface gravity (log g)2.25[5] cgs
Temperature4,255±31[4] K
Metallicity 0.08[5] dex
Other designations
k Hya, 51 Hya, NSV 6648, CD−27°9803, HD 125932, HIP 70306, HR 5381, SAO 182483[6]
Database references
SIMBADdata

51 Hydrae is a single[7] star in the equatorial constellation of Hydra,[6] located 170 light years away from the Sun.[1] It has the Bayer designation k Hydrae; 51 Hydrae is the Flamsteed designation.[6] This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.78. It is moving further from the Earth with a heliocentric radial velocity of +20 km/s.[2] Eggen (1971) listed it as a member of the η Cephei group of old-disk stars.[8]

This is an evolved giant star with a stellar classification of K4 III,[3] which indicates it has exhausted the supply of hydrogen at its core and expanded off the main sequence. It has 1.31[4] times the mass of the Sun but has swollen to 13.5[1] times the Sun's radius. The star is radiating 55[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,255 K.[4]

References

  1. ^ a b c d e f g h i j 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.
  2. ^ a b c d e 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.
  3. ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins Catalog of Revised MK Types for the Cooler Stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. ^ a b c d Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114
  5. ^ 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.
  6. ^ a b c "k Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 3, 2019.
  7. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  8. ^ Eggen, O. J. (June 1971), "The ζ Herculis, σ Puppis, ∈ Indi, and η Cephei Groups of Old Disk Population Stars", Publications of the Astronomical Society of the Pacific, 83 (493): 251, Bibcode:1971PASP...83..251E, doi:10.1086/129119.
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