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2001MNRAS.328..914Q - Mon. Not. R. Astron. Soc., 328, 914-924 (2001/December-2)
Orbital period changes of contact binary systems: direct evidence for thermal relaxation oscillation theory.
QIAN S.
Abstract (from CDS):
Furthermore, orbital period changes of 27 hot contact binaries have been checked. It is found that, apart from AW UMa with the lowest mass ratio (q=0.072), none shows an orbital period decrease. The relatively weak magnetic activity in the hotter contact binaries means little angular momentum loss (AML) from the systems via magnetic stellar winds. The period increases of these W UMa binaries can be explained by mass transfer from the secondary to the primary components, which is in agreement with the prediction of the thermal relaxation oscillation (TRO) models. This suggests that the evolution of a hotter W UMa star is mainly controlled by TRO. On the other hand, for a cooler W UMa star (M_1<=1.35 M_☉), its evolution may be TRO plus AML, which coincides with the recent results of Qian.
Abstract Copyright: The Royal Astronomical Society
Journal keyword(s): binaries: close - stars: evolution - stars: fundamental parameters - stars: oscillations
Simbad objects: 28
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