Xi Hydrae

Xi Hydrae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Hydra
Right ascension 11h 33m 00.11505s[1]
Declination −31° 51′ 27.4435″[1]
Apparent magnitude (V) 3.54[2]
Characteristics
Spectral type G7 III[2]
Astrometry
Radial velocity (Rv)−4.90±0.30[3] km/s
Proper motion (μ) RA: −209.62[1] mas/yr
Dec.: −40.84[1] mas/yr
Parallax (π)25.16 ± 0.16[1] mas
Distance129.6 ± 0.8 ly
(39.7 ± 0.3 pc)
Absolute magnitude (MV)+0.54[4]
Details
Mass2.94±0.15[5] M☉
Radius10.2±0.1[6] R☉
Luminosity57.65±2.39[6] L☉
Surface gravity (log g)2.87±0.02[5] cgs
Temperature5,044±40[5] K
Metallicity [Fe/H]+0.16±0.20[5] dex
Rotational velocity (v sin i)2.7[6] km/s
Other designations
ξ Lyr, 288 G. Hydrae, CD−31° 9083, HD 100407, HIP 56343, HR 4450, SAO 202558.[7]
Database references
SIMBADdata

Xi Hydrae, Latinized from ξ Hydrae, is a solitary[8] star in the equatorial constellation of Hydra. It received the Flamsteed designation 19 Crateris prior to joining the Hydra constellation.[9] This magnitude 3.54[2] star is situated 130 light-years from Earth and has a radius about 10 times that of the Sun. It is radiating 58 times as much luminosity as the Sun.[6] The star is now approaching the end of its life, and has expanded its outer envelope to become a red giant star.

One possible non-radial oscillation mode of Xi Hydrae

The star Xi Hya was particularly interesting in the field of asteroseismology when an international group of astronomers discovered that it behaves like a giant sub-ultra-bass musical instrument.[10]

References

  1. 1 2 3 4 5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M.
  3. ↑ 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, A61.
  4. ↑ 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.
  5. 1 2 3 4 Heiter, U.; Jofré, P.; Gustafsson, B.; Korn, A. J.; Soubiran, C.; Thévenin, F. (2015), "Gaia FGK benchmark stars: Effective temperatures and surface gravities", Astronomy & Astrophysics, 582: A49, arXiv:1506.06095, Bibcode:2015A&A...582A..49H, doi:10.1051/0004-6361/201526319.
  6. 1 2 3 4 Bruntt, H.; et al. (July 2010), "Accurate fundamental parameters for 23 bright solar-type stars", Monthly Notices of the Royal Astronomical Society, 405 (3): 1907–1923, arXiv:1002.4268, Bibcode:2010MNRAS.405.1907B, doi:10.1111/j.1365-2966.2010.16575.x.
  7. ↑ "ksi Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-22.
  8. ↑ 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.
  9. ↑ Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy, 18: 216, Bibcode:1987JHA....18..209W, doi:10.1177/002182868701800305.
  10. ↑ West, Richard (May 15, 2002), "Ultrabass Sounds of the Giant Star xi Hya: First Observations of Solar-type Oscillations in a Star Very Different from the Sun", Innovations Report, retrieved 2017-03-23.
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