Psi1 Aurigae

From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other star systems with this Bayer designation, see Psi Aurigae.
Diagram showing star positions and boundaries of the Auriga constellation and its surroundings
Cercle rouge 100%.svg

The 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]
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]
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
Distance approx. 4,000 ly
(approx. 1,200 pc)
Mass 14.4 ± 0.8[6] M
Radius 637 R
Luminosity 63,579[7] L
Temperature 3,750[3] K
Metallicity [Fe/H] +0.08[8] dex
Age 12.3 ± 0.4[6] Myr
Other designations
BD+49 1488, FK5 242, HD 44537, HIP 30520, HR 2289, SAO 41076.[9]

Psi1 Aurigae1 Aur, ψ1 Aurigae) is the Bayer designation for 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.

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[6] times as massive as the Sun and is blazing with 63,579[7] 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.


  1. ^ a b c d e f 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. ^ a b c d 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. ^ a b c d 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. ^ a b 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 (35), Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W. 
  6. ^ a b c 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. 
  7. ^ a b 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. 
  8. ^ 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. 
  9. ^ "phi Aur -- Star in double system", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-08-23. 

External links[edit]