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2003MNRAS.342.1260Q - Mon. Not. R. Astron. Soc., 342, 1260-1270 (2003/July-2)
Are overcontact binaries undergoing thermal relaxation oscillation with variable angular momentum loss.
QIAN S.
Abstract (from CDS):
Based on the period variations of 59 overcontact binaries, a statistical investigation of period change is given. It is confirmed that the period change of a W UMa-type binary star is correlated with the mass ratio (q) and with the mass of the primary component (M1). Meanwhile, some statistical relations (M1-P, Js-M1, J s-M2and Js-P) for overcontact binaries are presented using the absolute parameters of 78 systems. From these relations, the following results may be drawn: (i) free mass transfer in both directions exists between the components, which is assumed by thermal relaxation oscillation (TRO) theory; (ii) angular momentum loss (AML) can make a W UMa-type star maintain shallow overcontact and not evolve from overcontact to semidetached configurations as proposed by Rahunen; (iii) the evolution of the W UMa-type systems may be oscillation around a critical mass ratio, while the critical mass ratio varies with the mass of the primary component. These results can be plausibly explained by the combination of the TRO and the variable AML via a change of depth of the overcontact, which is consistent with the X-ray and IUE observations.
Abstract Copyright: 2003 RAS
Journal keyword(s): binaries: close - stars: evolution - stars: magnetic fields - stars: mass-loss
Simbad objects: 32
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