HD 6

Last updated
HD 6
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Pisces [1]
Right ascension 00h 05m 03.82339s [2]
Declination −00° 30′ 10.9306″ [2]
Apparent magnitude  (V)6.30±0.01 [3]
Characteristics
Evolutionary stage horizontal branch [4]
Spectral type K0 III [5]
U−B color index +1.03 [6]
B−V color index +1.11 [6]
Astrometry
Radial velocity (Rv)15.3±0.7 [7] km/s
Proper motion (μ)RA: +45.245 mas/yr [2]
Dec.: −53.594 mas/yr [2]
Parallax (π)6.9277±0.0368  mas [2]
Distance 471 ± 3  ly
(144.3 ± 0.8  pc)
Absolute magnitude  (MV)0.62 [1]
Details
Mass 1.95 [8]   M☉
Radius 12.4 [9]   R☉
Luminosity 72.4 [10]   L☉
Surface gravity (log g)1.8 [4]   cgs
Temperature 4,807±75 [9]   K
Metallicity [Fe/H]−0.03 [4]   dex
Rotational velocity (v sin i)2.8±0.8 [11]  km/s
Age 1.62 [8]   Gyr
Other designations
62 G. Piscium, AG−00°4, BD−01°4525, GC 51, HD 6, HIP 417, HR 2, SAO 128569 [12]
Database references
SIMBAD data

HD 6 is a star in the equatorial constellation of Pisces, and is located a couple of degrees southeast of the intersection between the ecliptic and the celestial equator. It is a yellow-hued star that is just barely visible to the naked eye with an apparent visual magnitude of 6.3. [3] The star is located at a distance of 471 light years from the Sun based on parallax, [2] and is drifting further away with a radial velocity of 15.3  km/s . [7] It has an absolute magnitude of 0.62. [1]

An evolved red giant with a stellar classification K0 III, [5] the star has moved off the main sequence by cooling and expanding. At the age of 1.6 billion years, [8] is now a red clump giant on the horizontal branch that is engaged in core helium fusion. [4] It has nearly double the mass of the Sun [8] and has expanded to 12.4 [9] times the Sun's radius. The star is radiating 72 times the luminosity of the Sun [10] from its photosphere at an effective temperature of 4,807 K. [9]

References

  1. 1 2 3 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.
  2. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361.
  4. 1 2 3 4 Tautvaišienė, G.; et al. (March 2013), "Red clump stars of the Milky Way - laboratories of extra-mixing", Monthly Notices of the Royal Astronomical Society, 430 (1): 621–627, arXiv: 1304.4393 , Bibcode:2013MNRAS.430..621T, doi: 10.1093/mnras/sts663 , S2CID   119211439.
  5. 1 2 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
  6. 1 2 Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals. 7. Bibcode:1971ROAn....7.....C.
  7. 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  8. 1 2 3 4 Demarque, Pierre; Woo, Jong-Hak; Kim, Yong-Cheol; Yi, Sukyoung K. (December 2004). "Y2 Isochrones with an Improved Core Overshoot Treatment". The Astrophysical Journal Supplement Series. 155 (2): 667–674. arXiv: astro-ph/0409024 . Bibcode:2004ApJS..155..667D. doi: 10.1086/424966 . eISSN   1538-4365. ISSN   0067-0049.
  9. 1 2 3 4 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881.
  10. 1 2 Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv: 1507.01466 . Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. eISSN   1538-3881. ISSN   0004-6256. S2CID   118505114.
  11. ↑ Fekel, Francis C.; Watson, Lyndon C. (November 1998). "A Search for Lithium-rich Giants among Stars with Infrared Excesses". The Astronomical Journal. 116 (5): 2466–2474. Bibcode:1998AJ....116.2466F. doi: 10.1086/300614 . ISSN   0004-6256.
  12. ↑ "HD 6". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-07-02.
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