Psi1 Aurigae

Psi1 Aurigae (ψ1 Aur, ψ1 Aurigae) is a star in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 4.91.[2] Based upon a measured annual parallax shift of 0.82 mas,[1] it is approximately 4,000 light-years (1,200 parsecs) distant from the Earth.

For other stars with this Bayer designation, see ψ Aurigae.
Psi1 Aurigae
Location of ψ1 Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  06h 24m 53.90129s[1]
Declination +49° 17′ 16.4199″[1]
Apparent magnitude (V) 4.91[2]
Characteristics
Spectral type M0 I[3]
U−B color index +2.29[2]
B−V color index +1.97[2]
R−I color index 1.07
Variable type LC[4]
Astrometry
Radial velocity (Rv)+4.7[5] km/s
Proper motion (μ) RA: –0.66[1] mas/yr
Dec.: –1.82[1] mas/yr
Parallax (π)0.82 ± 0.28[1] mas
Distanceapprox. 4,000 ly
(approx. 1,200 pc)
Absolute magnitude (MV)−5.53[6]
Details
Mass14.4 ± 0.8[7] M☉
Radius600[lower-alpha 1] R☉
Luminosity63,579[8] L☉
Temperature3,750[3] K
Metallicity [Fe/H]+0.08[9] dex
Age12.3 ± 0.4[7] Myr
Other designations
46 Aurigae, BD+49 1488, FK5 242, HD 44537, HIP 30520, HR 2289, SAO 41076.[10]
Database references
SIMBADdata

This is a massive supergiant star with a stellar classification of M0 I.[3] It is a slow irregular variable of the LC type, with its brightness varying in magnitude by 0.44.[4] The star is more than 14[7] times as massive as the Sun and is blazing with 63,579[8] times the Sun's luminosity. This energy is being radiated into outer space from its outer atmosphere at an effective temperature of 3,750 K,[3] giving it the orange-red hue of a cool M-type star.

References
  1. van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. Note: see VizieR catalogue I/311.
  2. Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
  3. Levesque, Emily M.; et al. (August 2005), "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought", The Astrophysical Journal, 628 (2): 973–985, arXiv:astro-ph/0504337, Bibcode:2005ApJ...628..973L, doi:10.1086/430901.
  4. Adelman, Saul J. (2001), "Stars with the Largest Hipparcos Photometric Amplitudes", Baltic Astronomy, 10: 589–593, Bibcode:2001BaltA..10..589A.
  5. Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W.
  6. Schiavon, Ricardo P. (July 2007), "Population Synthesis in the Blue. IV. Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations", The Astrophysical Journal Supplement Series, 171 (1): 146–205, arXiv:astro-ph/0611464, Bibcode:2007ApJS..171..146S, doi:10.1086/511753.
  7. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  8. Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355.
  9. Bakos, Gustav A. (October 1971), "Abundances of Heavy Elements in Late-Type Stars", Journal of the Royal Astronomical Society of Canada, 65: 222, Bibcode:1971JRASC..65..222B.
  10. "psi01 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-23.

Notes
  1. Calculated from effective temperature and luminosity figures, with reference to the nominal solar temperature of 5,772 K
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