Psi4 Aurigae, Latinized from ψ4 Aurigae, is a single,[9] 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.
  | |
| 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] |
| Distance | 320 ± 10 ly (99 ± 3 pc) |
| Absolute magnitude (MV) | +0.06[5] |
| Details | |
| Radius | 24.9[6] R☉ |
| Luminosity | 155[6] L☉ |
| Surface gravity (log g) | 2.04±0.24[7] cgs |
| Temperature | 4,085±125[6] K |
| Metallicity [Fe/H] | 0.10±0.08[7] dex |
| Rotational velocity (v sin i) | 4.8[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a K-type giant star with a stellar classification of K5 III.[3] It has expanded to 25 times the Sun's radius and is radiating 155 times the Sun's luminosity from its photosphere at an effective temperature of about 4,158 K.[6] The atmosphere displays a significant enhancement of silicon.[10]
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
editReferences
edit- ^ 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.
- ^ 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.
- ^ 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.
- ^ a b 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.
- ^ 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.
- ^ a b c d McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Psi4 Aurigae's database entry at VizieR.
- ^ a b 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.
- ^ "psi04 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.
- ^ 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.
- ^ 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