S Normae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Norma |
| Right ascension | 16h 18m 51.8325s |
| Declination | -57° 53' 59.244"' |
| Apparent magnitude (V) | 6.446 |
| Characteristics | |
| Spectral type | F8-G0Ib |
| U−B color index | ? |
| B−V color index | ? |
| Variable type | Classical Cepheid |
| Astrometry | |
| Radial velocity (Rv) | 4.9 km/s |
| Proper motion (μ) | RA: -1.10 mas/yr Dec.: -1.20 mas/yr |
| Parallax (π) | 1.19 ± 0.75 mas |
| Distance | approx. 3,000 ly (approx. 800 pc) |
| Absolute magnitude (MV) | -4.02[1] |
| Details | |
| Mass | 6.3[1] M☉ |
| Luminosity | 2800 L☉ |
| Temperature | 6350 K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
S Normae (S Nor) is a variable star in the constellation Norma. It is the brightest member of the open cluster NGC 6087. It is a well-known Classical Cepheid variable with a range of 6.12 to 6.77 and a period of 9.75411 days.[2] It is a yellow-white supergiant that is 6.3 times as massive as the Sun of spectral type F8-G0Ib. A binary, it has a 2.4 solar mass (M☉) companion that is a blue-white main sequence star of spectral type B9.5V.[1]
References
- ↑ 1.0 1.1 1.2 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. doi:10.1088/0004-6256/146/4/93.
- ↑ Watson, Christopher (4 January 2010). "S Normae". AAVSO Website. American Association of Variable Star Observers. Retrieved 12 March 2014.
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