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]

S Arae

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Ara
Right ascension	17^h 59^m 10.7311^s[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
S Ara, CD−49°11833, CPD−49°10361, HIP 88064[1]
Database references
SIMBAD	data

References

1. "V* S Ara". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 10, 2009.
2. 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.
3. Stock, J.; Wroblewski, H. (1972). "A southern objective prism survey". Publ. Obs. Astron. Nacional. 2. Bibcode:1972PDAUC...2...59S.
4. 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.
5. 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.