V636 Scorpii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 17h 22m 46.47796s |
| Declination | −45° 36′ 51.3868″ |
| Apparent magnitude (V) | 6.4-6.92[1] |
| Characteristics | |
| Spectral type | F7/8Ib/II-G5[1] |
| Variable type | delta Cep type |
| Astrometry | |
| Radial velocity (Rv) | 9.09 ± 0.17 km/s |
| Proper motion (μ) | RA: -3.05 ± 1.03 mas/yr Dec.: -2.40 ± 0.38 mas/yr |
| Parallax (π) | 1.15 ± 0.76 mas |
| Distance | approx. 3,000 ly (approx. 900 pc) |
| Absolute magnitude (MV) | -3.64[2] |
| Details | |
| Mass | 5.6[2] M☉ |
| Radius | ? R☉ |
| Luminosity | 2500[2] L☉ |
| Surface gravity (log g) | ? cgs |
| Temperature | ? K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
| Database references | |
| SIMBAD | data |
V636 Scorpii is a Classical Cepheid variable in the constellation Scorpius with a range of 6.4 to 6.92 and a period of 6.79671 days.[1]
It is a yellow-white supergiant that is 5.6 times as massive as the Sun. A triple system, it has a 2.4 solar mass (M☉) companion that is a blue-white main sequence star of spectral type B9.5V.[2]
References
- 1 2 3 Watson, Christopher (4 January 2010). "V636 Scorpii". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 29 July 2015.
- 1 2 3 4 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. arXiv:1307.7123v1. Bibcode:2013AJ....146...93R. doi:10.1088/0004-6256/146/4/93.
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