Astronomy:38 Aurigae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 03m 17.94729s[1] |
| Declination | +42° 54′ 41.5433″[1] |
| Apparent magnitude (V) | 6.08[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | K0 III[4] |
| B−V color index | 0.979±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | +33.69±0.20[2] km/s |
| Proper motion (μ) | RA: +121.023[1] mas/yr Dec.: −144.427[1] mas/yr |
| Parallax (π) | 13.8158 ± 0.2136[1] mas |
| Distance | 236 ± 4 ly (72 ± 1 pc) |
| Absolute magnitude (MV) | 1.572[5] |
| Details | |
| Mass | 1.59[5] M☉ |
| Radius | 7[6] R☉ |
| Luminosity | 18.47[2] L☉ |
| Surface gravity (log g) | 2.95[5] cgs |
| Temperature | 4,834[5] K |
| Metallicity [Fe/H] | −0.17[5] dex |
| Age | 3.6±1.0[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
38 Aurigae is a star located 236[1] light years away from the Sun in the northern constellation of Auriga.[8] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 6.08.[2] The star is moving further from the Earth with a heliocentric radial velocity of +34 km/s,[2] and it has a relatively high proper motion, traversing the celestial sphere at the rate of 0.181 arc seconds per annum.[9] It is a probable member of the Hercules stream.[7]
This object is an aging giant star with a stellar classification of K0 III.[4] At the age of around 3.6[7] billion years it is a red clump giant, which indicates it is on the horizontal branch and is generating energy via helium fusion at its core.[3] The star has 1.59[5] times the mass of the Sun and has expanded to 7[6] times the Sun's radius. It is radiating 18[2] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,834 K.[5]
38 Aurigae has a faint common proper motion companion at an angular separation of 152″, which is equivalent to a projected separation of 12,160 astronomical unit|AU. This is a red dwarf star with a class of M5.3.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Mishenina, T. V. et al. (September 2006), "Elemental abundances in the atmosphere of clump giants", Astronomy and Astrophysics 456 (3): 1109–1120, doi:10.1051/0004-6361:20065141, Bibcode: 2006A&A...456.1109M.
- ↑ 4.0 4.1 Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin 51: 79, Bibcode: 1962RGOB...51...79E.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Liu, Yujuan et al. (August 2010), "Stellar Parameters and Abundance Analysis of 58 Late G Giants", Publications of the Astronomical Society of Japan 62 (4): 1071–1084, doi:10.1093/pasj/62.4.1071, Bibcode: 2010PASJ...62.1071L.
- ↑ 6.0 6.1 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.
- ↑ 7.0 7.1 7.2 Ramya, P. et al. (August 2016), "Chemical compositions and kinematics of the Hercules stream", Monthly Notices of the Royal Astronomical Society 460 (2): 1356–1370, doi:10.1093/mnras/stw852, Bibcode: 2016MNRAS.460.1356R.
- ↑ 8.0 8.1 "38 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=38+Aur.
- ↑ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal 129 (3): 1483–1522, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L.
- ↑ Dhital, Saurav et al. (2010), "Sloan Low-mass Wide Pairs of Kinematically Equivalent Stars (SLoWPoKES): A Catalog of Very Wide, Low-mass Pairs", The Astronomical Journal 139 (6): 2566–2586, doi:10.1088/0004-6256/139/6/2566, Bibcode: 2010AJ....139.2566D.
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