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For other stars with this Bayer designation, see ψ Aurigae.
Psi4 Aurigae
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  mas [1]
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 Aur, 55 Aurigae, BD+44° 1518, FK5 2517, HD 47914, HIP 32173, HR 2459, SAO 41288 [7]
Database references
SIMBAD data

Psi4 Aurigae, Latinized from ψ4 Aurigae, is a single, [8] orange-hued star in the northern constellation of Auriga. It is 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]

It was also known to be part of a much bigger constellation named Telescopium Herschelii before it was unrecognized by the International Astronomical Union (IAU).

See also

References

  1. ^ a b c d e f 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, S2CID  18759600.
  2. ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
  3. ^ a b 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. ^ a b c d e f 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, S2CID  121883397.
  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, S2CID  119257644.
  6. ^ a b c d 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, S2CID  54940439, 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, S2CID  14878976.
  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

External links

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