Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246...47r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 246, NO. 1/SEP1, P. 47, 1990
Astronomy and Astrophysics
Astronomy
14
Scientific paper
Radial velocities for both components of the contact binary system VW Boo are presented for the first time. The orbital analysis is combined with an analysis of Binnendijk's B light curve to yield masses, radii and luminosities for the system. It is shown that the best solution to the light curve is obtained by incorporating a hotspot at the substellar point on the secondary component which is 640+60 K hotter than the surrounding photosphere and is 37±1° in radius.
The primary component is a normal main-sequence star, but the secondary is oversized relative to ZAMS stars of the same mass, and hence overluminous. In the HR diagram, the secondary lies mid-way between the secondaries of normal W-type contact binaries (those in true thermal contact), and the increasing number of marginal-contact (or B-type) systems which display EB light curves (those in poor or no thermal contact). Since this is the first such system to be found in such a location, it could suggest that the transition phase from B-type to W-type systems is a short-lived one.
Bell Aaron S.
Hilditch Ron W.
Rainger P. P.
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