Are Contact Binaries Undergoing Thermal Relaxation Oscillations with Contact Discontinuity?

Details Are Contact Binaries Undergoing Thermal Relaxation Oscillations with Contact Discontinuity? Are Contact Binaries Undergoing Thermal Relaxation Oscillations with Contact Discontinuity?

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110..782w&link_type=abstract

Astronomical Journal v.110, p.782

Astronomy and Astrophysics

Astronomy

5

Cataclysmic Variables, Binaries: Close, Stars: Kinematics

Scientific paper

We investigate the redistributions of total luminosities with the common convective envelope (CCE) which interacts with the components by 32 contact binaries with good quality observational data. It is found that the secondaries are expanding with the mean velocity of 8.7(m/yr) in A types whereas ones are contracting with the mean velocity of 0.32(m/yr) in W types, and the primaries are expanding with the mean velocity of 2373.7(m/yr) and 17.9(m/yr) for the A types and W types, respectively. These strongly support thermal relaxation oscillation (TRO) theory, however, in the meantime, also strongly imply that therein A types may be exist a contact discontinuity (DSC) layer which can be maintained by the secondary's expansion whereas in W types the discontinuity layer could be ironed out by the secondary's contraction which also produces the so-called W-type light curves. If the secondary of an A type has a discontinuity layer, then the difficulty of comparable times on contact configuration in the TRO theory could be alleviated. These results indicate that contact binaries are undergoing thermal relaxation oscillations with contact.

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