1 Scorpii
| Observation data EpochJ2000.0EquinoxJ2000.0 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 15h50m58.74452s[1] |
| Declination | −25° 45′ 04.6649″[1] |
| Apparent magnitude(V) | 4.63[2] |
| Characteristics | |
| Spectral type | B1.5 Vn[3] |
| B−Vcolor index | −0.072±0.003[2] |
| Astrometry | |
| Radial velocity(Rv) | −3.0±4.7[4]km/s |
| Proper motion(μ) | RA:−14.20[1]mas/yr Dec.:−25.12[1]mas/yr |
| Parallax(π) | 6.59 ± 0.27mas[1] |
| Distance | 490 ± 20ly (152 ± 6pc) |
| Absolute magnitude(MV) | −1.27[2] |
| Details | |
| Mass | 8.3±0.2[5]M☉ |
| Radius | 3.7[6]R☉ |
| Luminosity | 3,890[6]L☉ |
| Temperature | 24,000[6]K |
| Rotational velocity(vsini) | 310[7]km/s |
| Age | 10.3±5.3[5]Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
1 Scorpii,orb Scorpii,is a single[9]starin the southernzodiacconstellationofScorpius.It has anapparent magnitudeof 4.63,[2]which is bright enough to be faintly visible to the naked eye on a dark night. The star shows an annualparallax shiftof 6.59masfrom Earth's orbit, which equates to a distance of roughly 490light years.It is a probable (89% chance) member of theSco OB2moving group.[10][9]
This is aB-type main-sequence starwith astellar classificationof B1.5 Vn,[3]where the 'n' suffix indicates "nebulous"absorption linesbeing induced by rapid rotation. It has aprojected rotational velocityof 310 km/s, which is giving the star anoblate shapewith anequatorial bulgethat is 13% wider than the polar radius.[7]There is some weak evidence that this is aBe starwith a gaseous disk that is being viewed edge-on.[11]
1 Scorpii is a young star at around 10[5]million years old, with 8.3[5]times themass of the Sunand 3.7 times theSun's radius.[6]The star is radiating 3,890 times theSun's luminosityfrom itsphotosphereat aneffective temperatureof about 24,000 K.[6]
References
[edit]- ^abcdevan 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,S2CID18759600.
- ^abcdAnderson, 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.
- ^abHouk, Nancy; Smith-Moore, M. (1978),Michigan catalogue of two-dimensional spectral types for the HD stars,vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode:1988mcts.book.....H.
- ^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,S2CID59451347,A61.
- ^abcdTetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun",Monthly Notices of the Royal Astronomical Society,410(1): 190–200,arXiv:1007.4883,Bibcode:2011MNRAS.410..190T,doi:10.1111/j.1365-2966.2010.17434.x,S2CID118629873.
- ^abcdeHernández, J. S.; et al. (2005), "Herbig Ae/Be Stars in nearby OB Associations",The Astronomical Journal,129(2): 856,arXiv:astro-ph/0410494,Bibcode:2005AJ....129..856H,doi:10.1086/426918,S2CID17672346.
- ^abBelle, G. T. (2012), "Interferometric observations of rapidly rotating stars",The Astronomy and Astrophysics Review,20(1): 51,arXiv:1204.2572,Bibcode:2012A&ARv..20...51V,doi:10.1007/s00159-012-0051-2,S2CID119273474.
- ^"b Sco".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2018-02-21.
- ^abEggleton, 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,S2CID14878976.
- ^Rizzuto, Aaron; et al. (October 2011), "Multidimensional Bayesian membership analysis of the Sco OB2 moving group",Monthly Notices of the Royal Astronomical Society,416(4): 3108–3117,arXiv:1106.2857,Bibcode:2011MNRAS.416.3108R,doi:10.1111/j.1365-2966.2011.19256.x,S2CID54510608.
- ^Rivinius, Th.; et al. (November 2006), "Bright Be-shell stars",Astronomy and Astrophysics,459(1): 137−145,Bibcode:2006A&A...459..137R,doi:10.1051/0004-6361:20053008.
