A1 (star)

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A1 {{Starbox observe | epoch=J2000.0 (ICRS) | constell=Carina | ra=11^h 15^m 09.1^s | dec=-61° 16′ 17″

Astrometry
Spectral type	?
Apparent magnitude (V)	9.1
Distance	20.000 Ly
Binary orbit
Period (P)	3.77 [1] days
Eccentricity (e)	?[1]
Inclination (i)	? [1]
Details
Mass	84.0 (primary)[1] / 30.0 (b)[1] M☉
Radius	(primary)[1] / ? (b)[1] R☉
Temperature	? (primary)[1] K

A1 is a massive binary star system located in NGC 3603, about 20,000 light years from Earth. Its two component stars have 114 solar masses and 84 solar masses, and circle each other every 3.77 days. The stars were identified and their masses calculated by a team from the Universite de Montreal.

[edit] References

1. ^ ^{a b c d e f g h} A planet-sized transiting star around OGLE-TR-122. Accurate mass and radius near the hydrogen-burning limit, F. Pont, C. H. F. Melo, F. Bouchy, S. Udry, D. Queloz, M. Mayor, and N. C. Santos, Astronomy and Astrophysics 433, #2 (April 11, 2005), pp. L21–L24.

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