Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-05-10
Astronomy and Astrophysics
Astrophysics
9 pages of text, 3 tables, and 4 figures; to appear in AJ, August 2002
Scientific paper
10.1086/341651
We describe new optical photometric and spectroscopic observations of the semi-detached eclipsing binary BG Geminorum. A large change in the amount of Mg I absorption at secondary maximum indicates the presence of cool material in the outer edge of the disk surrounding the unseen primary star. Detection of weak He I emission implies a hot radiation source at the inner edge of the disk. If the velocity variations in the Hbeta emission line track the orbital motion of the primary star, the primary star has an orbital semiamplitude of K1 = K(Hbeta) = 16.0 +- 4.6 km/sec. This result yields a mass ratio, q = 0.22 +- 0.07, consistent with the q = 0.1 derived from the large ellipsoidal variation. Despite this progress, the nature of the primary star - B-type star or black hole - remains uncertain.
Benson Priscilla
Groot Paul J.
Kenyon Scott. J.
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