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2002MNRAS.336.1247S - Mon. Not. R. Astron. Soc., 336, 1247-1255 (2002/November-2)
Short-period near-contact binary systems at the beginning of the overcontact phase.
SHENGBANG Q.
Abstract (from CDS):
Combined with the published data on the other systems of the same type, a possible statistical connection between orbital period P and its rate of decrease dP/d t is obtained: dP/d t =-5.3x10 –7xP + 1.3x10 –7 d yr –1. This correlation indicates that the smaller the orbital period P is, the smaller its rate of change dP/d t will be. The correlation found in this paper indicates that there may be a smooth transition from A- and F-type NCBs with period decreases to the A- and F-type overcontact binaries that have period increases, and in that sense one may postulate that the NCBs may be the progenitors of the A-type W UMa systems and will be oscillating around a marginal-contact state as predicted by thermal relaxation oscillation (TRO) theory.
Abstract Copyright: RAS
Journal keyword(s): binaries: close - stars: evolution - stars: mass-loss.
Simbad objects: 21
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