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S Arae (S Ara) is an RR Lyrae-type pulsating variable star in the constellation of Ara.[2] It has an apparent visual magnitude which varies between 9.92 and 11.24 during its 10.85-hour pulsation period,[1][3] and it exhibits the Blazhko effect.[6]

S Arae

A light curve for S Arae, adapted from Chadid et al. (2010)[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Ara
Right ascension 17h 59m 10.7311s[2]
Declination −49° 26′ 00.453″[2]
Apparent magnitude (V) 9.92 to 11.24[3]
Characteristics
Spectral type A3 II[4]
B−V color index 0.9[2]
Variable type RRab[3]
Astrometry
Radial velocity (Rv)185 ± 655.35[2] km/s
Proper motion (μ) RA: −26.24[2] mas/yr
Dec.: −8.44[2] mas/yr
Parallax (π)1.1191 ± 0.0431 mas[5]
Distance2,900 ± 100 ly
(890 ± 30 pc)
Absolute magnitude (MV)+0.78 – +0.93[6]
Details
Mass0.51 – 0.62[6] M☉
Radius3.01[5] R☉
Luminosity27[5] L☉
Surface gravity (log g)+2.9[6] cgs
Temperature6,563[5] K
Metallicity [Fe/H]−0.90[6] dex
Other designations
S Ara, CD−49°11833, CPD−49°10361, HIP 88064[2]
Database references
SIMBADdata

References


  1. Chadid, M.; Vernin, J.; Mekarnia, D.; Chapellier, E.; Trinquet, H.; Bono, G. (June–July 2010). "First Antarctica light curve PAIX monitoring of the Blazhko RR Lyrae star: S Arae". Astronomy & Astrophysics. 516. doi:10.1051/0004-6361/201014857. Retrieved 24 October 2021.
  2. "V* S Ara". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 November 2009.
  3. 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 10 November 2009.
  4. Stock, J.; Wroblewski, H. (1972). "A southern objective prism survey". Publ. Obs. Astron. Nacional. 2: 59. Bibcode:1972PDAUC...2...59S.
  5. 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.
  6. 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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