R Arae

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R Arae
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 16h 39m 44.7306s[1]
Declination −56° 59′ 39.867″[1]
Apparent magnitude (V) 6.65[1]
Spectral type B9IV/V[1]
B−V color index 0.09[1]
Variable type Algol[2]
Proper motion (μ) RA: -8.34[1] mas/yr
Dec.: -18.85[1] mas/yr
Parallax (π) 8.06 ± 1.66[1] mas
Distance approx. 400 ly
(approx. 120 pc)
Absolute magnitude (MV) 1.18
Other designations
HIP 81589, CD-56° 6482, SAO 244037, HD 149730.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

R Arae is an Algol-type eclipsing binary in the constellation Ara. Located approximately 124 parsecs (400 ly) distant,[1] it normally shines at magnitude 6.17, but during eclipses can fall as low as magnitude 7.32.[2] It has been suggested by multiple studies that mass transfer is occurring between the two stars of this system,[3][4] and the period of eclipses seems to be increasing over time.[4]


  1. ^ a b c d e f g h i "R Arae". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 30 June 2014. 
  2. ^ a b VSX (25 October 2010). "R Arae". AAVSO Website. American Association of Variable Star Observers. Retrieved 30 June 2014. 
  3. ^ Nield, K. M. (1991). "Observations and analysis of the Southern binary R Arae". Astrophysics and Space Science. 180 (2): 233. Bibcode:1991Ap&SS.180..233N. doi:10.1007/BF00648180. 
  4. ^ a b Reed, P. A.; McCluskey Jr., G. E.; Kondo, Y.; Sahade, J.; Guinan, E. F.; GiméNez, A.; Caton, D. B.; Reichart, D. E.; Ivarsen, K. M.; Nysewander, M. C. (2010). "Ultraviolet study of the active interacting binary star R Arae using archivalIUEdata". Monthly Notices of the Royal Astronomical Society. 401 (2): 913. arXiv:0909.4047Freely accessible. Bibcode:2010MNRAS.401..913R. doi:10.1111/j.1365-2966.2009.15741.x.