Summary
65 Aurigae is a binary star[7] system located 252 light years away from the Sun in the northern constellation of Auriga. It is visible to the naked eye as a faint, orange hued star with an apparent visual magnitude of 5.12.[2] The primary, designated component A, is an aging giant star with a stellar classification of K0 III.[3] It is 3.31[4] billion years old and has expanded to 13 times the Sun's radius after exhausting the hydrogen at its core.[1] Its companion, component B, is a magnitude 11.7 star located at an angular separation of 11.4″ from the primary, as of 2008.[7] The pair are moving further from the Earth with a heliocentric radial velocity of 22 km/s.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 07h 22m 02.61744s[1] |
| Declination | +36° 45′ 38.0957″[1] |
| Apparent magnitude (V) | 5.12[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| B−V color index | 1.082±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | 21.81±0.16[2] km/s |
| Proper motion (μ) | RA: −96.915[1] mas/yr Dec.: −22.436[1] mas/yr |
| Parallax (π) | 12.9673 ± 0.1294 mas[1] |
| Distance | 252 ± 3 ly (77.1 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.82[2] |
| Details | |
| 65 Aur A | |
| Mass | 1.34[4] M☉ |
| Radius | 13.02+0.47 −2.57[1] R☉ |
| Luminosity | 69.6±0.9[1] L☉ |
| Surface gravity (log g) | 2.72[3] cgs |
| Temperature | 4,575±17[4] K |
| Metallicity [Fe/H] | −0.35±0.04[2] dex |
| Rotational velocity (v sin i) | 0.0[5] km/s |
| Age | 3.31[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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).
References edit
- ^ a b c d e f g h Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g 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 Cenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society, 374 (2): 664–690, arXiv:astro-ph/0611618, Bibcode:2007MNRAS.374..664C, doi:10.1111/j.1365-2966.2006.11196.x, S2CID 119428437.
- ^ a b c d Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ 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.
- ^ "65 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-25.
- ^ a b 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.
External links edit
- HR 2793
- CCDM J07220+3646
- Image 65 Aurigae