Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..269p&link_type=abstract
Astronomy and Astrophysics, Vol. 274, NO. 1/JUL(I), P. 269, 1993
Astronomy and Astrophysics
Astrophysics
11
Stars: Binaries: General, Individual Stars: Bw Vul, Stars: Variable
Scientific paper
All available photometric and radial-velocity observations of the large-amplitude β Cephei star BW Vul are analyzed in order to study the period changes in this star. We show that these changes can be fully explained in terms of an evolutionary constant-rate change equal to +2.34 s cen-1 and the light-time effect in a binary system. After removing the evolutionary contribution from the 0 - C diagram, we derive the spectroscopic elements of the primary's orbit. Although no direct observational technique allows the hypothetical companion to be observed at present, precise radial-velocity observations could reveal its presence in the future. In addition, we find the changes of the phase-lag between the radial-velocity and light curves to be negligible.
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