39 Aurigae
39 Aurigae is a single[7] star in the constellation of Auriga. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712. The star is just barely visible to the naked eye, having an apparent visual magnitude of 5.90.[2] Based upon an annual parallax shift of 20.11[1] mas as seen from Earth, it is located 112 light years away. 5 Andromedae is moving further from the Sun with a radial velocity of +34 km/s.[3] It has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.151 arc seconds per year.[8]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 05m 03.38423s[1] |
| Declination | +42° 58′ 53.8846″[1] |
| Apparent magnitude (V) | 5.90[2] |
| Characteristics | |
| Spectral type | F1 V[2] |
| B−V color index | 0.358±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | +34.1±2.9[3] km/s |
| Proper motion (μ) | RA: −45.17[1] mas/yr Dec.: −144.26[1] mas/yr |
| Parallax (π) | 20.11 ± 0.40 mas[1] |
| Distance | 162 ± 3 ly (49.7 ± 1.0 pc) |
| Absolute magnitude (MV) | 2.45[4] |
| Details | |
| Mass | 1.45[5] M☉ |
| Luminosity | 9.36[2] L☉ |
| Surface gravity (log g) | 4.14±0.14[5] cgs |
| Temperature | 7,161±243[5] K |
| Metallicity [Fe/H] | −0.03±0.15[2] dex |
| Rotational velocity (v sin i) | 87.8±4.4[4] km/s |
| Age | 603[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an F-type main-sequence star with a stellar classification of F1 V.[2] It is an estimated 603[5] million years old with a relatively high rate of spin, showing a projected rotational velocity of around 88 km/s.[4] The star has 1.45[5] times the mass of the Sun and it is radiating 9.36[2] times the Sun's luminosity from its photosphere at an effective temperature of around 7,161 K.[5]
References 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 e f g h 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 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b c Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
- ^ a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ "39 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-07.
- ^ 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.
- ^ 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, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.