منابع مشابه
Contact Binaries
Despite being the most abundant (by space density) of interacting binary stars, W Ursae Majoris (W UMa) stars are not understood structurally. Their stellar components are in physical contact, and share a common convective envelope. Observations demand large-scale energy exchange between components, as do considerations of hydrostatic and thermal equilibrium. Yet solutions in complete equilibri...
متن کاملThermals in contact binaries
The buoyant rise of thermals (i.e. bubbles of enhanced entropy, but initially in pressure equilibrium) is investigated numerically in three dimensions for the case of an adiabatically stratified layer covering 6–9 pressure scale heights. It is found that these bubbles can travel to large heights before being braked by the excess pressure that builds up in order to drive the gas sideways in the ...
متن کاملThe structure of contact binaries
In radiative layers of rotating stars the luminosity carried by circulation currents through a surface of constant entropy (circulation luminosity) is shown to be positive. The corresponding decrease in the temperature gradient is important in the secondary of contact binaries. This result removes the deadlock in the theory of contact binaries. The resulting treatment of contact binaries is inv...
متن کاملContact Discontinuities in Models of Contact Binaries Undergoing Thermal Relaxation Oscillations
In this paper we pursue the suggestion by Shu, Lubow & Anderson (1979) and Wang (1995) that contact discontinuity (DSC) may exist in the secondary in the expansion TRO (thermal relaxation oscillation) state. It is demonstrated that there is a mass exchange instability in some range of mass ratio for the two components. We show that the assumption of constant volume of the secondary should be re...
متن کاملThe energy balance in contact binaries
We derive the global energy balance in contact binaries evolving on a thermal time-scale, including the semidetached phase. Effects of accretion and rotation are taken into account. Within the framework of standard assumptions (uniform rotation, conservation of mass and angular momentum, spherically averaged components, each of them in hydrostatic equilibrium) the discussion is exact.
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1971
ISSN: 0252-9211
DOI: 10.1017/s025292110003308x