Astronomy:V636 Scorpii
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Short description: Spectroscopic binary star system in the constellation Scorpius
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 17h 22m 46.47796s[2] |
| Declination | −45° 36′ 51.3868″[2] |
| Apparent magnitude (V) | 6.40 - 6.92[3] |
| Characteristics | |
| Cepheid | |
| Spectral type | F7/8Ib/II-G5[3] |
| Variable type | δ Cep[3] |
| companion | |
| Spectral type | B9.5V[4] |
| Astrometry | |
| Radial velocity (Rv) | 9.09 ± 0.17[5] km/s |
| Proper motion (μ) | RA: -3.05 ± 1.03[2] mas/yr Dec.: -2.40 ± 0.38[2] mas/yr |
| Parallax (π) | 1.15 ± 0.76[2] mas |
| Distance | approx. 3,000 ly (approx. 900 pc) |
| Absolute magnitude (MV) | -3.64[4] |
| Orbit | |
| Period (P) | 1,318 days[4] |
| Semi-major axis (a) | 6.7[4] |
| Eccentricity (e) | 0.26[6] |
| Details | |
| Cepheid | |
| Mass | 5.6[4] M☉ |
| Radius | ~50[7] R☉ |
| Luminosity | 2,500[4] L☉ |
| Metallicity | +0.07[8] |
| companion | |
| Mass | 2.4 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
V636 Scorpii is a multiple star system in the constellation Scorpius, 3,000 light years away. The primary is a Classical Cepheid (δ Cephei) variable and its visual magnitude varies from 6.4 to 6.9.
V636 Scorpii is a spectroscopic binary, and the fainter companion is thought to itself consist of two stars. The primary is a luminous yellow star and a δ Cephei variable. The less massive companion orbits every 3.6 years and is apparently a B9.5 main sequence star, but the dynamics of the system suggest that it may actually be a pair of stars is a close orbit.[9]
The Cepheid primary pulsates regularly with a period of 6.79671 days. It is a yellow-white supergiant or bright giant that is 5.6 times as massive as the Sun and 2,500 times as luminous.[4]
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Evans, Nancy Remage; Bond, Howard E.; Schaefer, Gail H.; Mason, Brian D.; Karovska, Margarita; Tingle, Evan (2013). "Binary Cepheids: Separations and Mass Ratios in 5M ⊙ Binaries". Astronomical Journal 146 (4): 93, 10 pp. doi:10.1088/0004-6256/146/4/93. Bibcode: 2013AJ....146...93E.
- ↑ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G. et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics 424 (2): 727–732. doi:10.1051/0004-6361:20041213. Bibcode: 2004A&A...424..727P.
- ↑ Evans, Nancy Remage; Carpenter, Kenneth G.; Robinson, Richard; Kienzle, Francesco; Dekas, Anne E. (2005). "High-Mass Triple Systems: The Classical Cepheid Y Carinae". The Astronomical Journal 130 (2): 789–793. doi:10.1086/430458. Bibcode: 2005AJ....130..789E.
- ↑ Moskalik, P.; Gorynya, N. A. (2005). "Mean Angular Diameters and Angular Diameter Amplitudes of Bright Cepheids". Acta Astronomica 55: 247. Bibcode: 2005AcA....55..247M.
- ↑ Marsakov, V. A.; Koval', V. V.; Kovtyukh, V. V.; Mishenina, T. V. (2013). "Properties of the population of classical Cepheids in the Galaxy". Astronomy Letters 39 (12): 851. doi:10.1134/S1063773713120050. Bibcode: 2013AstL...39..851M.
- ↑ Böhm-Vitense, E.; Evans, N. R.; Carpenter, K.; Albrow, Michael D.; Cottrell, P. L.; Robinson, R.; Beck-Winchatz, B. (1998). "The Mass of the Cepheid Binary V636 Scorpii". The Astrophysical Journal 505 (2): 903. doi:10.1086/306177. Bibcode: 1998ApJ...505..903B.
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