42 Aurigae
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h17m34.6465s[1] |
| Declination | +46° 25′ 26.230″[1] |
| Apparent magnitude(V) | 6.53[2] |
| Characteristics | |
| Spectral type | F0 V[3]or A6 Vp(4481 wk)n[4] |
| B−Vcolor index | 0.263±0.003[2] |
| Astrometry | |
| Radial velocity(Rv) | −12.0±1.0[5]km/s |
| Proper motion(μ) | RA:−43.520[1]mas/yr Dec.:+11.147[1]mas/yr |
| Parallax(π) | 13.24 ± 0.38mas[1] |
| Distance | 246 ± 7ly (76 ± 2pc) |
| Absolute magnitude(MV) | 2.27[2] |
| Details | |
| Mass | 1.70±0.02[6]M☉ |
| Luminosity | 10.29[2]L☉ |
| Surface gravity(logg) | 4.18±0.14[7]cgs |
| Temperature | 7,660±260[7]K |
| Rotational velocity(vsini) | 228[6]km/s |
| Age | 1.042[7]Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
42 Aurigaeis astarin the northernconstellationofAuriga.Thedesignationis from the star catalogue of English astronomerJohn Flamsteed,first published in 1712. It has anapparent visual magnitudeof 6.53,[2]which places it just below the visibility limit for normal eyesight under good seeing conditions. It displays an annualparallax shiftof 13.24mas,which yields a distance estimate of around 246light years.The star is moving closer to the Sun with aradial velocityof −12 km/s.[5]It is a member of theUrsa Major Moving Groupof stars that share a common motion through space.[9]
The star was assigned astellar classificationof F0 V byNancy Romanin 1949,[3]indicating it is anF-type main-sequence star.However, in 1995 Abt and Morrell catalogued it as classA6 Vp(4481 wk)n;[4]a somewhat hotter and more massiveA-type main-sequence starthat displays spectral peculiarities as well as nebulous lines brought about by rapid rotation. It is around a billion years old[7]with a high rate of spin, showing aprojected rotational velocityof 228 km/s.[6]The star has an estimated 1.7[6]times themass of the Sunand is radiating 10[2]times theSun's luminosityfrom itsphotosphereat aneffective temperatureof around 7,660 K.[7]
References
[edit]- ^abcdeGaia Collaboration; et al. (November 2016), "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties",Astronomy & Astrophysics,595:23,arXiv:1609.04172,Bibcode:2016A&A...595A...2G,doi:10.1051/0004-6361/201629512,S2CID1828208,A2.
- ^abcdefAnderson, 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,S2CID119257644.
- ^abRoman, Nancy Grace (September 1949), "The Ursa Major Group",Astrophysical Journal,110:205,Bibcode:1949ApJ...110..205R,doi:10.1086/145199.
- ^abAbt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars",Astrophysical Journal Supplement,99:135,Bibcode:1995ApJS...99..135A,doi:10.1086/192182.
- ^abde 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,S2CID59451347,A61.
- ^abcdZorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities",Astronomy & Astrophysics,537:A120,arXiv:1201.2052,Bibcode:2012A&A...537A.120Z,doi:10.1051/0004-6361/201117691,S2CID55586789,A120.
- ^abcdeDavid, 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,S2CID33401607.
- ^"42 Aur".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2018-02-07.
- ^Chupina, N. V.; et al. (June 2006), "Kinematic structure of the corona of the Ursa Major flow found using proper motions and radial velocities of single stars",Astronomy and Astrophysics,451(3): 909–916,Bibcode:2006A&A...451..909C,doi:10.1051/0004-6361:20054009.
