R Arae

R Arae
Observation data; Epoch J2000 Equinox J2000
Constellation	Ara
Right ascension	16h 39m 44.7306s
Declination	−56° 59′ 39.867″
Apparent magnitude (V)	6.65
Characteristics
Spectral type	B9IV/V
B−V color index	0.09
Variable type	Algol
Astrometry
Proper motion (μ)	RA: -8.34 mas/yr ; Dec.: -18.85 mas/yr
Parallax (π)	8.06 ± 1.66 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
SIMBAD	data
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]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ "R Arae". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 30 June 2014.
^ ^a ^b VSX (25 October 2010). "R Arae". AAVSO Website. American Association of Variable Star Observers. Retrieved 30 June 2014.
^ 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.
^ ^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:0909.4047. Bibcode:2010MNRAS.401..913R. doi:10.1111/j.1365-2966.2009.15741.x.{{cite journal}}: CS1 maint: unflagged free DOI (link)

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[SIMBAD-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.

[AAVSO-2] VSX (25 October 2010). "R Arae". AAVSO Website. American Association of Variable Star Observers. Retrieved 30 June 2014.

[Nield-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.

[Reed-4] 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:0909.4047. Bibcode:2010MNRAS.401..913R. doi:10.1111/j.1365-2966.2009.15741.x.{{cite journal}}: CS1 maint: unflagged free DOI (link)

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Observation data Epoch J2000 Equinox J2000
Constellation	Ara
Right ascension	16^h 39^m 44.7306^s^[1]
Declination	−56° 59′ 39.867″^[1]
Apparent magnitude (V)	6.65^[1]
Characteristics
Spectral type	B9IV/V^[1]
B−V color index	0.09^[1]
Variable type	Algol^[2]
Astrometry

Proper motion (μ)	RA: -8.34^[1] mas/yr Dec.: -18.85^[1] mas/yr
Parallax (π)	8.06 ± 1.66 mas^[1]
Distance	approx. 400 ly (approx. 120 pc)
Absolute magnitude (M_V)	1.18

Other designations
HIP 81589, CD-56° 6482, SAO 244037, HD 149730.
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)