Astronomy:Psi4 Aurigae
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| Observation data 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 |
| Distance | 320 ± 10 ly (99 ± 3 pc) |
| Absolute magnitude (MV) | +0.06[5] |
| Details | |
| Radius | 33[4] R☉ |
| Luminosity | 245[4] L☉ |
| Surface gravity (log g) | 2.04±0.24[6] cgs |
| Temperature | 3,970±41[6] K |
| Metallicity [Fe/H] | 0.10±0.08[6] dex |
| Rotational velocity (v sin i) | 4.8[4] km/s |
| Other designations | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 3.1 Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal 116: 122, doi:10.1086/145598, Bibcode: 1952ApJ...116..122R.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 6.3 Prugniel, Ph. et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics 531: 25, doi:10.1051/0004-6361/201116769, A165, Bibcode: 2011A&A...531A.165P.
- ↑ "psi04 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=psi04+Aur.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Franchini, M. et al. (January 2004), "Synthetic Lick Indices and Detection of α-Enhanced Stars", The Astrophysical Journal 601 (1): 485–499, doi:10.1086/380443, Bibcode: 2004ApJ...601..485F
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