Rho Scorpii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 15h 56m 53.07624s[1] |
| Declination | −29° 12′ 50.6612″ [1] |
| Apparent magnitude (V) | 3.86[2] |
| Characteristics | |
| Spectral type | B2 IV[3] |
| U−B color index | -0.82[2] |
| B−V color index | -0.20[2] |
| Astrometry | |
| Radial velocity (Rv) | −0.40[4] km/s |
| Proper motion (μ) | RA: −15.68[1] mas/yr Dec.: −24.88[1] mas/yr |
| Parallax (π) | 6.91 ± 0.19[1] mas |
| Distance | 470 ± 10 ly (145 ± 4 pc) |
| Orbit[5] | |
| Period (P) | 4.0033 d |
| Eccentricity (e) | 0.27 |
| Periastron epoch (T) | 2442178.6060 JD |
| Argument of periastron (ω) (secondary) | 231° |
| Semi-amplitude (K1) (primary) | 16.40 km/s |
| Details | |
| Mass | 7.94±0.55[3] M☉ |
| Radius | 5.0[6] R☉ |
| Luminosity (bolometric) | 3,432[3] L☉ |
| Temperature | 21,150[3] K |
| Rotational velocity (v sin i) | 113[7] km/s |
| Other designations | |
Rho Scorpii (ρ Sco, ρ Scorpii) is a binary star in the constellation Scorpius. It has an apparent visual magnitude of +3.87, which is bright enough to be seen with the naked eye. Based upon parallax measurements, it is located approximately 472 light years from the Sun.[1] At that distance, the visual magnitude of the star is reduced by 0.07 due to extinction from interstellar dust.[9]
The primary component A is a single-lined spectroscopic binary with an orbital period of 4 days and an eccentricity of 0.27.[5] This pair displays the spectrum of blue-white B-type subgiant with a stellar classification of B2 IV.[3] It has an estimated mass nearly 8 times that of the Sun and shines with 3,432 times the Sun's luminosity.[3] A third star, component B, is a magnitude 12.80 visual companion that lies at an angular separation of 38.40 arcseconds along a position angle of 95°, as of the year 2000.[10]
Rho Scorpii is a member of the Upper Scorpius OB association.[11]
References
- 1 2 3 4 5 6 van Leeuwen, F. (November 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. - 1 2 3 Ducati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", CDS/ADC Collection of Electronic Catalogues, 2237, Bibcode:2002yCat.2237....0D.
- 1 2 3 4 5 6 Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355.
- ↑ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E.
- 1 2 Pourbaix, D.; et al. (September 2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213.
- ↑ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
- ↑ Simón-Díaz, S.; Herrero, A. (2014), "The IACOB project: I. Rotational velocities in northern Galactic O- and early B-type stars revisited. The impact of other sources of line-broadening", Astronomy & Astrophysics, 562: A135, arXiv:1311.3360, Bibcode:2014A&A...562A.135S, doi:10.1051/0004-6361/201322758.
- ↑ "rho Sco -- Spectroscopic binary", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-22.
- ↑ Shatsky, N.; Tokovinin, A. (January 2002), "The mass ratio distribution of B-type visual binaries in the Sco OB2 association", Astronomy and Astrophysics, 382: 92–103, arXiv:astro-ph/0109456, Bibcode:2002A&A...382...92S, doi:10.1051/0004-6361:20011542.
- ↑ Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
- ↑ Grellmann, R.; et al. (June 2015), "New constraints on the multiplicity of massive young stars in Upper Scorpius", Astronomy & Astrophysics, 578: 11, Bibcode:2015A&A...578A..84G, doi:10.1051/0004-6361/201219577, A84.
External links
- Kaler, James B. (June 20, 2008), "Rho Scorpii", Stars, University of Illinois, retrieved 2016-09-23.