Xi Aurigae

Xi Aurigae, Latinized from ξ Aurigae, is the Bayer designation for a single,[9] white-hued star in the northern constellation of Auriga. This star was once considered part of the constellation of Camelopardalis and held the Flamsteed designation 32 Camelopardalis.[10] It is visible to the naked eye with an apparent visual magnitude of +5.0.[2] The measured annual parallax shift of this star is 13.69 ± 0.28 mas,[1] which corresponds to a physical distance of 238 light-years (73 parsecs) with a 5 light-year margin of error. At that distance, the visual magnitude of the star is diminished by an extinction of 0.108 due to interstellar dust.[11]

Xi Aurigae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Auriga
Right ascension  05h 54m 50.78082s[1]
Declination +55° 42′ 25.0084″[1]
Apparent magnitude (V) +5.00[2]
Characteristics
Spectral type A2 Va[3]
U−B color index +0.12[2]
B−V color index +0.05[2]
Astrometry
Radial velocity (Rv)−13.3±2.4[4] km/s
Proper motion (μ) RA: −45.43[1] mas/yr
Dec.: −29.97[1] mas/yr
Parallax (π)10.08 ± 0.33[1] mas
Distance320 ± 10 ly
(99 ± 3 pc)
Absolute magnitude (MV)+0.64[5]
Details[6]
Mass1.96 M☉
Radius1.1[7] R☉
Luminosity49.5[5] L☉
Surface gravity (log g)3.88 cgs
Temperature9,152±311 K
Metallicity [Fe/H]−0.36±0.04[5] dex
Rotational velocity (v sin i)62 km/s
Age174 Myr
Other designations
ξ Ari, 30 Aurigae, BD+55° 1027, FK5 1157, HD 39283, HIP 27949, HR 2029, SAO 25450[8]
Database references
SIMBADdata

This is an A-type main sequence star with a stellar classification of A2 Va.[3] Although it was one of the first stars to be cataloged as a Lambda Boötis star, Murphy et al. (2015) don't consider it to be a member of this population.[3] The star has nearly twice[6] the mass of the Sun and about 1.1[7] times the Sun's radius. It is an estimated 174[6] million years old and is spinning with a projected rotational velocity of 62 km/s.[6] Xi Aurigae is radiating 49.5[5] times the Sun's luminosity from its photosphere at an effective temperature of around 9,152 K.[6]

References
  1. 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. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Murphy, Simon J.; et al. (October 2015), "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue", Publications of the Astronomical Society of Australia, 32: 43, arXiv:1508.03633, Bibcode:2015PASA...32...36M, doi:10.1017/pasa.2015.34, e036.
  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, A61.
  5. 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.
  6. 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.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 5211–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. "ksi Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.
  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.
  10. Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy, 18 (3): 213, Bibcode:1987JHA....18..209W, doi:10.1177/002182868701800305.
  11. Murphy, Simon J.; Paunzen, Ernst (April 2017), "Gaia's view of the λ Boo star puzzle", Monthly Notices of the Royal Astronomical Society, 466 (1): 546–555, arXiv:1612.01528, Bibcode:2017MNRAS.466..546M, doi:10.1093/mnras/stw3141.
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