From Wikipedia, the free encyclopedia
6 Hydrae
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Hydra
Right ascension 08h 40m 01.47182s [1]
Declination −12° 28′ 31.3433″ [1]
Apparent magnitude (V) 4.98 [2]
Characteristics
Evolutionary stage giant
Spectral type K3 III [3]
B−V color index 1.415±0.001 [2]
Astrometry
Radial velocity (Rv)−7.8±0.6 [4] km/s
Proper motion (μ) RA: −81.619 [1]  mas/ yr
Dec.: −1.646 [1]  mas/ yr
Parallax (π)8.7394 ± 0.1769  mas [1]
Distance373 ± 8  ly
(114 ± 2  pc)
Absolute magnitude (MV)−0.40 [2]
Details
Radius32.7+0.5
−2.6
[1]  R
Luminosity267±6 [1]  L
Surface gravity (log g)1.91 [5]  cgs
Temperature4,080+173
−30
[1]  K
Metallicity [Fe/H]−0.21 [5]  dex
Other designations
a Hya, 6 Hya, BD−11°2420, HD 73840, HIP 42509, HR 3431, SAO 154515 [6]
Database references
SIMBAD data

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

  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ 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.
  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 "6 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-23.
  7. ^ 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.
  8. ^ 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.
From Wikipedia, the free encyclopedia
6 Hydrae
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Hydra
Right ascension 08h 40m 01.47182s [1]
Declination −12° 28′ 31.3433″ [1]
Apparent magnitude (V) 4.98 [2]
Characteristics
Evolutionary stage giant
Spectral type K3 III [3]
B−V color index 1.415±0.001 [2]
Astrometry
Radial velocity (Rv)−7.8±0.6 [4] km/s
Proper motion (μ) RA: −81.619 [1]  mas/ yr
Dec.: −1.646 [1]  mas/ yr
Parallax (π)8.7394 ± 0.1769  mas [1]
Distance373 ± 8  ly
(114 ± 2  pc)
Absolute magnitude (MV)−0.40 [2]
Details
Radius32.7+0.5
−2.6
[1]  R
Luminosity267±6 [1]  L
Surface gravity (log g)1.91 [5]  cgs
Temperature4,080+173
−30
[1]  K
Metallicity [Fe/H]−0.21 [5]  dex
Other designations
a Hya, 6 Hya, BD−11°2420, HD 73840, HIP 42509, HR 3431, SAO 154515 [6]
Database references
SIMBAD data

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

  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ 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.
  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 "6 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-23.
  7. ^ 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.
  8. ^ 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.

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