Astronomy:1 Scorpii
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 15h 50m 58.74452s[1] |
| Declination | −25° 45′ 04.6649″[1] |
| Apparent magnitude (V) | 4.63[2] |
| Characteristics | |
| Spectral type | B1.5 Vn[3] |
| B−V color 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 ± 0.27[1] mas |
| Distance | 490 ± 20 ly (152 ± 6 pc) |
| 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 (v sin i) | 310[7] km/s |
| Age | 10.3±5.3[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
1 Scorpii, or b Scorpii, is a single[9] star in the southern zodiac constellation of Scorpius. It has an apparent magnitude of 4.63,[2] which is bright enough to be faintly visible to the naked eye on a dark night. The star shows an annual parallax shift of 6.59 mas from Earth's orbit, which equates to a distance of roughly 490 light years. It is a probable (89% chance) member of the Sco OB2 moving group.[10][9]
This is a B-type main-sequence star with a stellar classification of B1.5 Vn,[3] where the 'n' suffix indicates "nebulous" absorption lines being induced by rapid rotation. It has a projected rotational velocity of 310 km/s, which is giving the star an oblate shape with an equatorial bulge that is 13% wider than the polar radius.[7] There is some weak evidence that this is a Be star with 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 the mass of the Sun and 3.7 times the Sun's radius.[6] The star is radiating 3,890 times the Sun's luminosity from its photosphere at an effective temperature of about 24,000 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 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 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 5.0 5.1 5.2 5.3 Tetzlaff, 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 6.0 6.1 6.2 6.3 6.4 Hernández, J. S. et al. (2005), "Herbig Ae/Be Stars in nearby OB Associations", The Astronomical Journal 129 (2): 856, doi:10.1086/426918, Bibcode: 2005AJ....129..856H.
- ↑ 7.0 7.1 Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V.
- ↑ "b Sco". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=b+Sco.
- ↑ 9.0 9.1 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1111/j.1365-2966.2011.19256.x, Bibcode: 2011MNRAS.416.3108R.
- ↑ Rivinius, Th. et al. (November 2006), "Bright Be-shell stars", Astronomy and Astrophysics 459 (1): 137−145, doi:10.1051/0004-6361:20053008, Bibcode: 2006A&A...459..137R.
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