Astronomy:Psi8 Aurigae

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Short description: Star in the constellation Auriga


For other stars with a similar Bayer designation, see ψ Aurigae.
Psi8 Aurigae
Location of ψ8 Aurigae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Auriga[1]
Right ascension  06h 53m 57.073s[2]
Declination +38° 30′ 18.07″[2]
Apparent magnitude (V) 6.46[1]
Characteristics
Spectral type B9.5p[3]
Apparent magnitude (J) 6.471±0.034[4]
Apparent magnitude (H) 6.532±0.036[4]
Apparent magnitude (K) 6.514±0.018[4]
B−V color index −0.044±0.007[1]
Variable type Constant[1]
Astrometry
Radial velocity (Rv)27.1±1.0[1] km/s
Proper motion (μ) RA: −1.307[2] mas/yr
Dec.: −27.406[2] mas/yr
Parallax (π)4.8897 ± 0.0602[2] mas
Distance667 ± 8 ly
(205 ± 3 pc)
Absolute magnitude (MV)−0.31[1]
Details
Mass2.0[5] M☉
Radius3.1[5] R☉
Luminosity100[5] L☉
Surface gravity (log g)3.68[5] cgs
Temperature10,200[5] K
Metallicity [Fe/H]−0.161[6] dex
Rotational velocity (v sin i)40±9[7] km/s
Age234[5] Myr
Other designations
ψ8 Aurigae, 61 Aurigae, BD+38°1638, HD 50204, HIP 33133, HR 2547, SAO 59589[8]
Database references
SIMBADdata

Psi8 Aurigae is a star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ψ8 Aurigae, and abbreviated Psi8 Aur or ψ8 Aur. This star is just visible to the naked eye with an apparent visual magnitude of 6.443. Based upon parallax measurements,[2] it is approximately 667 light-years (205 parsecs) distant from the Earth. It is receding from the Sun with a radial velocity of 27 km/s.[1]

The spectrum of the star has a stellar classification of B9.5p, matching a very late B-type star with unspecified luminosity class. The "p" indicates a peculiarity in the spectrum.[3] φ8 Aurigae has been reported to be an Ap star with unusually string silicon lines in its spectrum, or a mercury-manganese star,[9] but it is now considered doubtful whether it is actually a chemically peculiar star.[10]

This star has double the mass of the Sun and more than triple the Sun's radius. It is an estimated 234[5] million years old and is spinning with a projected rotational velocity of 40 km/s.[7] The star is radiating 100 times the luminosity of the Sun from its photosphere at an effective temperature of 10,200 K.[5]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Template:Cite XHIP
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940.  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 Cowley, A. et al. (1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal 74: 375–406. doi:10.1086/110819. Bibcode: 1969AJ.....74..375C. 
  4. ↑ 4.0 4.1 4.2 Skrutskie, Michael F. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S.  Vizier catalog entry
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Glagolevskij, Yu. V. (2019). "On Properties of Main Sequence Magnetic Stars". Astrophysical Bulletin 74 (1): 66. doi:10.1134/S1990341319010073. Bibcode: 2019AstBu..74...66G. 
  6. ↑ Cardiel, Nicolás et al. (2021). "RGB photometric calibration of 15 million Gaia stars". Monthly Notices of the Royal Astronomical Society 507 (1): 318. doi:10.1093/mnras/stab2124. Bibcode: 2021MNRAS.507..318C. 
  7. ↑ 7.0 7.1 Abt, Helmut A. et al. (2002). "Rotational Velocities of B Stars". The Astrophysical Journal 573 (1): 359–365. doi:10.1086/340590. Bibcode: 2002ApJ...573..359A. 
  8. ↑ "* psi08 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+psi08+Aur. 
  9. ↑ Osawa, Kiyoteru (1965). "Spectral classification and three-color photometry of A-type peculiar stars". Annals of the Tokyo Astronomical Observatory 9 (3): 121. Bibcode: 1965AnTok...9..121O. 
  10. ↑ Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HGMN and Am stars". Astronomy and Astrophysics 498 (3): 961. doi:10.1051/0004-6361/200810788. Bibcode: 2009A&A...498..961R. 



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