An Unusual Interacting Eclipsing Binary

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

HD5501 is an unusual eclipsing binary star discovered in the course of a survey for classical A-type shell stars. It initially excited interest because it shows variable shell lines. We report here on photometry and spectroscopy of this star carried out over a number of years. We derive the orbital period,estimate the mass of its primary star, and deduce the existence of an accretion disk around the secondary which appears to be a compact object.

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