Astronomy:15 Sagittarii
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Short description: Star in the constellation Sagittarius
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 15m 12.90641s[1] |
| Declination | −20° 43′ 41.7738″[1] |
| Apparent magnitude (V) | 5.37[2] |
| Characteristics | |
| Spectral type | O9.7 Iab[3] or B0 Iab[4] |
| B−V color index | 0.007±0.004[5] |
| Astrometry | |
| Radial velocity (Rv) | −6.3±2.8[6] km/s |
| Proper motion (μ) | RA: +1.60[1] mas/yr Dec.: −1.51[1] mas/yr |
| Parallax (π) | 0.10 ± 0.45[1] mas |
| Distance | 4,200±650[7] ly (1,300±200 pc) |
| Details[8] | |
| 15 Sgr Aa | |
| Mass | ~30[4] M☉ |
| Radius | 28.6±12.5 R☉ |
| Luminosity | 4.47+3.85 −2.07×105 L☉ |
| Surface gravity (log g) | 3.10 cgs |
| Temperature | 28,000±1,000 K |
| Rotational velocity (v sin i) | 83±7[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
15 Sagittarii is a blue-hued binary star[10] system in the southern zodiac constellation of Sagittarius. The estimated distance based upon photometry is around 4,200 ly (1,300 pc).[7] It is faintly visible to the naked eye with an apparent visual magnitude of 5.37.[2] The system is moving closer to the Sun with a heliocentric radial velocity of around −6 km/s.[6]
Chini et al. (2012) identify this as a double-lined spectroscopic binary star system.[10] It shows a stellar classification of O9.7 Iab,[3] matching a massive O-type supergiant star. Along with the O-type star 16 Sgr (HD 167263), it is ionizing an H II region along the western edge of the molecular cloud L291.[11]
The Washington Double Star Catalog lists four companions within a 2 arcsecond angular radius.[12]
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 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.
- ↑ 3.0 3.1 Sota, A.; Maíz Apellániz, J. (2014). "The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars". The Astrophysical Journal Supplement 211 (1): 10. doi:10.1088/0067-0049/211/1/10. Bibcode: 2014ApJS..211...10S.
- ↑ 4.0 4.1 4.2 Fraser, M.; Dufton, P. L.; Hunter, I.; Ryans, R. S. I. (May 2010), "Atmospheric parameters and rotational velocities for a sample of Galactic B-type supergiants", Monthly Notices of the Royal Astronomical Society 404 (3): 1306−1320, doi:10.1111/j.1365-2966.2010.16392.x, Bibcode: 2010MNRAS.404.1306F
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 Kemp, S. N. et al. (December 1996), "Further optical and UV spectroscopy of stars in the direction of the Riegel & Crutcher cold cloud", Monthly Notices of the Royal Astronomical Society 283 (3): 1089–1101, doi:10.1093/mnras/283.3.1089, Bibcode: 1996MNRAS.283.1089K.
- ↑ Martins, F. et al. (February 2015), "Radial dependence of line profile variability in seven O9-B0.5 stars", Astronomy & Astrophysics 574: 38, doi:10.1051/0004-6361/201423882, A142, Bibcode: 2015A&A...574A.142M.
- ↑ "15 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=15+Sgr.
- ↑ 10.0 10.1 Chini, R. et al. (August 2012), "A spectroscopic survey on the multiplicity of high-mass stars", Monthly Notices of the Royal Astronomical Society 424 (3): 1925–1929, doi:10.1111/j.1365-2966.2012.21317.x, Bibcode: 2012MNRAS.424.1925C
- ↑ Marti, J. et al. (October 1993), "HH 80-81: A Highly Collimated Herbig-Haro Complex Powered by a Massive Young Star", Astrophysical Journal 416: 208, doi:10.1086/173227, Bibcode: 1993ApJ...416..208M
- ↑ Sana, H. et al. (November 2014), "Southern Massive Stars at High Angular Resolution: Observational Campaign and Companion Detection", The Astrophysical Journal Supplement Series 215 (1): 35, doi:10.1088/0067-0049/215/1/15, 15, Bibcode: 2014ApJS..215...15S.
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