Astronomy:Psi6 Aurigae
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 06h 47m 39.576s[2] |
| Declination | +48° 47′ 22.14″[2] |
| Apparent magnitude (V) | +5.22[3] |
| Characteristics | |
| Spectral type | K0.5 III[4] |
| U−B color index | +1.04[3] |
| B−V color index | +1.11[3] |
| Variable type | Constant[1] |
| Astrometry | |
| Radial velocity (Rv) | −6.51±0.30[5] km/s |
| Proper motion (μ) | RA: +3.988[2] mas/yr Dec.: +4.748[2] mas/yr |
| Parallax (π) | 8.0121 ± 0.1402[2] mas |
| Distance | 407 ± 7 ly (125 ± 2 pc) |
| Absolute magnitude (MV) | +0.01[1] |
| Orbit[6] | |
| Period (P) | 5,996±26 d |
| Eccentricity (e) | 0.044±0.014 |
| Periastron epoch (T) | 52556 ± 310 MJD |
| Argument of periastron (ω) (secondary) | 222±19° |
| Semi-amplitude (K1) (primary) | 3.24±0.04 km/s |
| Details[7] | |
| ψ6 Aur A | |
| Mass | 2.02±0.28 M☉ |
| Radius | 17.72±0.76 R☉ |
| Luminosity | 123.4±10.2 L☉ |
| Surface gravity (log g) | 2.25±0.07 cgs |
| Temperature | 4,574±26 K |
| Metallicity [Fe/H] | −0.08±0.10 dex |
| Rotational velocity (v sin i) | +10[8] km/s |
| Age | 1.55±0.67 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Psi6 Aurigae is a spectroscopic binary[6] star system in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ψ6 Aurigae, and abbreviated Psi6 Aur or ψ6 Aur. This system is visible as a dim, naked eye star with an apparent visual magnitude of +5.22.[3] Based upon a measured annual parallax shift of 8.01 mas,[2] it is approximately 407 light-years (125 parsecs) distant from the Earth. The system is drifting closer to the Sun with a radial velocity of −6.5 km/s.[5]
This is a single-lined spectroscopic binary star system with an orbital period of 5,996 days (16.4 years) and an eccentricity of 0.044.[6] The visible component is an evolved K-type giant star with a stellar classification of K0.5 III.[4] It is most likely (78% chance) on the red giant branch and is around 1.55 billion years old. As such, it has an estimated double the mass of the Sun and about 18 times the Sun's radius. The star is radiating about 123 times the Sun's luminosity from its photosphere at an effective temperature of 4,574 K.[7]
References
- ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society 133 (4): 475–493, doi:10.1093/mnras/133.4.475, Bibcode: 1966MNRAS.133..475A.
- ↑ 4.0 4.1 Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245–266, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 6.2 Griffin, R. F. (February 2010), "Spectroscopic binary orbits from photoelectric radial velocities - Paper 210: Psi2 Aurigae and 34 Pegasi", The Observatory 130 (1): 17–32, Bibcode: 2010Obs...130...17G.
- ↑ 7.0 7.1 Reffert, Sabine et al. (2015), "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity", Astronomy & Astrophysics 574: A116, doi:10.1051/0004-6361/201322360, Bibcode: 2015A&A...574A.116R. The values presented are for the RGB branch model.
- ↑ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago 239: 1, Bibcode: 1970CoAsi.239....1B.
- ↑ "psi06 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=psi06+Aur.
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