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 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
Distance2,900 ± 100 ly
(890 ± 30 pc)
Absolute magnitude (MV)+0.78 - +0.93[5]
Details
Mass0.51 - 0.62[5] M☉
Radius3.01[4] R☉
Luminosity27[4] L☉
Surface gravity (log g)+2.9[5] cgs
Temperature6,563[4] K
Metallicity [Fe/H]−0.90[5] dex
Other designations
S Ara, CD−49°11833, CPD−49°10361, HIP 88064[1]
Database references
SIMBADdata

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: 59. 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.


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