Psi9 Aurigae

For other stars with a similar Bayer designation, see ψ Aurigae.
Psi9 Aurigae
Location of ψ9 Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga[1]
Right ascension 06h 56m 32.05797s[2]
Declination +46° 16′ 26.3957″[2]
Apparent magnitude (V) 5.75[3]
Characteristics
Spectral type B8 IIIe[4]
U−B color index −0.46[5]
B−V color index −0.06[5]
Astrometry
Radial velocity (Rv)−41.1±2.9[6] km/s
Proper motion (μ) RA: −3.263 mas/yr[2]
Dec.: +5.040 mas/yr[2]
Parallax (π)3.4481±0.0560 mas[2]
Distance950 ± 20 ly
(290 ± 5 pc)
Absolute magnitude (MV)−2.03[1]
Details
Mass2.4[7] M☉
Radius3.7[3] R☉
Luminosity868[1] L☉
Surface gravity (log g)2.71[7] cgs
Temperature9,573[7] K
Metallicity [Fe/H]−0.55[8] dex
Rotational velocity (v sin i)235[9] km/s
Other designations
ψ9 Aur, BD+46 1203, HD 50658, HIP 33377, HR 2568, SAO 41446[10]
Database references
SIMBADdata

Psi9 Aurigae is a star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ψ9 Aurigae, and abbreviated Psi9 Aur or ψ9 Aur. This star is dimly visible to the naked eye with an apparent visual magnitude of 5.75. Based upon an annual parallax shift of 3.45 mas, the distance to this star is approximately 950 light-years (290 parsecs). It is drifting closer to the Sun with a radial velocity of −41 km/s.[6] This is most likely (88.5% chance) a runaway star, having a peculiar velocity of 31.8+14.6
−12.4 km/s.[11]

The spectrum of Psi9 Aurigae matches a giant star with a stellar classification of B8 IIIe.[4] The 'e' suffix indicates this is a Be star that shows emission lines of hydrogen in its spectrum. This is caused by a circumstellar shell of hot gas. The emission undergoes variability on a time scale of sixteen years.[4] This star is spinning rapidly with a projected rotational velocity of 235 km/s.[9] It has 2.4[7] times the mass of the Sun and 3.7 times the Sun's radius.[3] ψ9 Aur is radiating 868[1] times the luminosity of the Sun from its photosphere at an effective temperature of 9,573 K.[7]

References

  1. ^ 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. XHIP record for this object at VizieR.
  2. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  4. ^ a b c Ghosh, K. K. (September 1989), "Search for rapid spectral variability in Psi(9) Aurigae", Publications of the Astronomical Society of the Pacific, 101: 839–843, Bibcode:1989PASP..101..839G, doi:10.1086/132504.
  5. ^ a b Crawford, D. L. (February 1963), "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars", Astrophysical Journal, 137: 530, Bibcode:1963ApJ...137..530C, doi:10.1086/147526.
  6. ^ a b Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  7. ^ a b c d e Stassun, Keivan G.; et al. (2018), "The TESS Input Catalog and Candidate Target List", The Astronomical Journal, 156 (3): 102, arXiv:1706.00495, Bibcode:2018AJ....156..102S, doi:10.3847/1538-3881/aad050.
  8. ^ Cardiel, Nicolás; et al. (2021), "RGB photometric calibration of 15 million Gaia stars", Monthly Notices of the Royal Astronomical Society, 507 (1): 318, arXiv:2107.08734, Bibcode:2021MNRAS.507..318C, doi:10.1093/mnras/stab2124.
  9. ^ a b Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  10. ^ "* psi09 Aur", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2012-08-23.
  11. ^ Boubert, D.; Evans, N. W. (July 2018), "On the kinematics of a runaway Be star population", Monthly Notices of the Royal Astronomical Society, 477 (4): 5261–5278, arXiv:1804.05849, Bibcode:2018MNRAS.477.5261B, doi:10.1093/mnras/sty980.
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