Keywords :
binaries spectroscopic - stars: individual: alpha Lib A - stars: rotation
Abstract:The spectroscopy of rapidly rotating binary stars occasionally encounters systems where - paradoxically - the primary is effectively hidden in the light of its secondary. Here, we report on a bright textbook example of this kind with the nearby A-type star {alpha} Lib A. Although discovered as a spectroscopic binary already in the year 1904, a radial velocity curve has never been published up to a point where the existence of the secondary became even suspicious. However, in this work, we demonstrate that {alpha} Lib A is indeed a double-lined spectroscopic binary with a rapidly rotating - and hence almost invisible - A-type primary, accompanied and predominated by a more slowly rotating late-A or early F-type secondary in an eccentric
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