On the apsidal motion of BP Vulpeculae

Details On the apsidal motion of BP Vulpeculae On the apsidal motion of BP Vulpeculae

2008-12-12

arxiv.org/abs/0812.2363v1

Astronomy and Astrophysics

Astrophysics

accepted for New Astronomy; two figures

Scientific paper

10.1016/j.newast.2008.12.002

BP Vulpeculae is a bright eclipsing binary system showing apsidal motion. It was found in an earlier study that it shows retrograde apsidal motion which contradicts theory. In this paper we present the first $BV$ light curve of the system and its light curve solution as well as seven new times of the minima from the years 1959-1963. This way we could expanded the baseline of the investigation to five decades. Based on this longer baseline we concluded that the apsidal motion is prograde agreeing with the theoretical expectations and its period is about 365 years and the determined internal structure constant is close to the theoretically expected one.

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