Is the Algol-type Eclipsing Binary RX Geminorum a True Triple System?

Astronomy and Astrophysics – Astronomy

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Stars: Binaries: Close, Stars: Individual (Rx Geminorum)

Scientific paper

An analysis of the times of minimum light for the long-period Algol-type eclipsing binary RX Gem is presented based on a new linear ephemeris. The O-C curve shows a cyclic oscillation with a period of 55.7 yr and a semiamplitude of 0.0645 day. Assuming the change to be due to the presence of a ``third body'' revolving around the RX Gem system, the parameters of the third body's orbit are derived. Since the third-body assumption is in good agreement with the spectroscopic data from several authors and with published photometric solutions (Gaposchkin, Hall, & Walter; Giuricin et al.), RX Gem is likely to be a triple system. In this case, the third body is an A-type star in a circular orbit, which is nearly coplanar to the orbit of the eclipsing pair. However, the recent light-curve analysis by Olson & Etzel does not show any third light, so the third star (M3>2.41 Msolar) may be an unseen neutron star or black hole. Additional eclipse timings over the next decade will be important to verify the presence of the third body.

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