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2001MNRAS.328..635Q - Mon. Not. R. Astron. Soc., 328, 635-644 (2001/December-1)
A possible relation between the period change and the mass ratio for W-type contact binaries.
QIAN S.
Abstract (from CDS):
In order to check this conclusion, secular period changes of 30 W-type contact binaries have been collected from the literature. It is found that systems showing period increase usually have a higher mass ratio (q>0.4), and the periods of low-mass ratio systems (q<0.4) are varying in a secular decrease. This strongly suggests that a relation between the orbital period variation and the mass ratio for W-type contact binaries may exist. If the secular period change is caused by conservative mass transfer between the components, this relation may suggest that the evolution of the W-type systems is oscillation around a critical mass ratio (q∼0.4). However this is highly speculative. On the other hand, the relation may be potentially strong observational evidence for Rahunen's conclusion that angular momentum loss (AML) may enable the components of a contact binary to remain in good contact throughout the thermal relaxation oscillation (TRO) cycle. This connection could be explained by the combination of the TRO and the variable AML via the change of depth of contact, which needs further studies observationally and theoretically.
Abstract Copyright: The Royal Astronomical Society
Journal keyword(s): binaries: close - stars: evolution - stars: general
Simbad objects: 31
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