HD 125442

HD 125442
Observation data
Epoch J2000      Equinox J2000
Constellation Lupus
Right ascension 14h 20m 42.58071s[1]
Declination −45° 11′ 13.4190″[1]
Apparent magnitude (V) 4.78[2]
Characteristics
Spectral type F0 IV[3]
B−V color index 0.310±0.003[2]
Astrometry
Radial velocity (Rv)+0.0±3.7[4] km/s
Proper motion (μ) RA: +37.33[5] mas/yr
Dec.: −72.81[5] mas/yr
Parallax (π)22.1448 ± 0.3265 mas[1]
Distance147 ± 2 ly
(45.2 ± 0.7 pc)
Absolute magnitude (MV)1.49[6]
Details
Mass1.49[7] M☉
Luminosity19.24[2] L☉
Surface gravity (log g)3.95±0.14[7] cgs
Temperature7,344±250[7] K
Rotational velocity (v sin i)148±10[6] km/s
Age614[7] Myr
Other designations
CD−44° 9236, HD 125442, HIP 70104, HR 5364, SAO 224843[8]
Database references
SIMBADdata

HD 125442 is a single[9] star in the southern constellation of Lupus. Its apparent visual magnitude is 4.78,[2] which can be seen with the naked eye. The distance to HD 125442, as determined from its annual parallax shift of 22.1 mas,[1] is 147 light years.

This is an F-type subgiant star with a stellar classification of F0 IV,[3] having, at the age of 614[7] million years, used up the hydrogen at its core and begun the process of evolving into a giant star. It has 1.49[7] times the mass of the Sun and is radiating 19[2] times the Sun's luminosity from its photosphere at an effective temperature of 7,344 K.[7] The star displays a high rate of spin with a projected rotational velocity of 148 km/s.[6]

References

  1. ^ a b c d 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.
  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 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. ^ 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 van Leeuwen, F. (November 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, S2CID 18759600.
  6. ^ a b c Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
  7. ^ a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  8. ^ "HD 125442". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-22.
  9. ^ 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.

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