Psi4 Aurigae

Psi4 Aurigae
Diagram showing star positions and boundaries of the Auriga constellation and its surroundings
The location of ψ4 Aurigae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Auriga
Right ascension 06h 43m 04.97107s[1]
Declination +44° 31′ 28.0220″[1]
Apparent magnitude (V) +5.02[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.83[2]
B−V color index +1.48[2]
Astrometry
Radial velocity (Rv)−77.35±0.23[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)+0.06[5]
Details
Radius33[4] R☉
Luminosity245[4] L☉
Surface gravity (log g)2.04±0.24[6] cgs
Temperature3,970±41[6] K
Metallicity [Fe/H]0.10±0.08[6] dex
Rotational velocity (v sin i)4.8[4] km/s
Other designations
ψ4 Ari, 55 Aurigae, BD+44° 1518, FK5 2517, HD 47914, HIP 32173, HR 2459, SAO 41288[7]
Database references
SIMBADdata

Psi4 Aurigae, Latinized from ψ4 Aurigae, is the Bayer designation for a single,[8] orange-hued star in the northern constellation of Auriga. It is a faint star but visible to the naked eye with an apparent visual magnitude of +5.02.[2] With an annual parallax shift of 10.08 ± 0.33 mas,[1] it is approximately 324 light-years (99 parsecs) distant from Earth.

This is a K-type giant star with a stellar classification of K5 III.[3] It has expanded to 33[4] times the Sun's radius and is radiating 245[4] times the Sun's luminosity from its photosphere at an effective temperature of about 3,970 K.[6] The atmosphere displays a significant enhancement of silicon.[9]

References

  1. 1 2 3 4 5 6 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. 1 2 3 4 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. 1 2 Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598.
  4. 1 2 3 4 5 6 Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  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. 1 2 3 4 Prugniel, Ph.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: 25, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, A165.
  7. ↑ "psi04 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.
  8. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  9. ↑ Franchini, M.; et al. (January 2004), "Synthetic Lick Indices and Detection of α-Enhanced Stars", The Astrophysical Journal, 601 (1): 485–499, Bibcode:2004ApJ...601..485F, doi:10.1086/380443
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