S Arae
S Arae (S Ara) is an RR Lyrae-type pulsating variable star in the constellation of Ara.[1] It has an apparent visual magnitude which varies between 9.92 and 11.24,[2] and it exhibits the Blazhko effect.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 59m 10.7311s[1] |
| Declination | −49° 26′ 00.453″[1] |
| Apparent magnitude (V) | 9.92 to 11.24[2] |
| Characteristics | |
| Spectral type | A3 II[3] |
| B−V color index | 0.9[1] |
| Variable type | RRab[2] |
| Astrometry | |
| Radial velocity (Rv) | 185 ± 655.35[1] km/s |
| Proper motion (μ) | RA: −26.24[1] mas/yr Dec.: −8.44[1] mas/yr |
| Parallax (π) | 1.1191 ± 0.0431[4] mas |
| Distance | 2,900 ± 100 ly (890 ± 30 pc) |
| Absolute magnitude (MV) | +0.78 - +0.93[5] |
| Details | |
| Mass | 0.51 - 0.62[5] M☉ |
| Radius | 3.01[4] R☉ |
| Luminosity | 27[4] L☉ |
| Surface gravity (log g) | +2.9[5] cgs |
| Temperature | 6,563[4] K |
| Metallicity [Fe/H] | −0.90[5] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
- "V* S Ara". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 10, 2009.
- S Ara, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 10, 2009.
- Stock, J.; Wroblewski, H. (1972). "A southern objective prism survey". Publ. Obs. Astron. Nacional. 2. Bibcode:1972PDAUC...2...59S.
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Zalian, C.; Chadid, M.; Vernin, J.; Abe, L.; Agabi, A. (2016). "Antarctica photometry of the Blazhko RR Lyrae star S Arae". Monthly Notices of the Royal Astronomical Society. 456 (1): 192. Bibcode:2016MNRAS.456..192Z. doi:10.1093/mnras/stv2611.
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