Some Aspects of Illuminated Model Atmosphere Theory as Applied to Close Binary Systems

Details Some Aspects of Illuminated Model Atmosphere Theory as Applied to Close Binary Systems Some Aspects of Illuminated Model Atmosphere Theory as Applied to Close Binary Systems

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..989c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 263, NO.4/AUG15, P. 989, 1993

Astronomy and Astrophysics

Astronomy

5

Polarization - Radiative Transfer - Stars: Atmospheres - Binaries: Close

Scientific paper

Only recently has the use of irradiated stellar atmosphere models become practical in the study of close binary systems. Aspects of this problem, such as geometrical illumination from a finite solid angle, the transport of polarized radiation, and multiple-iterative heating between the stars, must be included for a realistic treatment. These concepts are developed and applied to grids of plane-parallel stellar atmospheres computed on modified Roche equipotentials. The `reflection effect' between the stars, actually a radiative heating of the outer layers of the atmosphere, is iterated to consistency, and the incident moments of the radiation field are integrated numerically. Grey model atmospheres, along with light and polarization curves, are calculated for illustrative purposes for a test system, V Puppis. Although some approximations are utilized to make the problem computationally tractable, realistic variations with orbital phase are produced. Despite the fact that the resulting light and polarization curves are not substantially different from those calculated with simpler approximations to the reflection effect, the ab initio nature of the present model atmosphere approach allows both the prediction of additional phenomena and a large reduction in the number of arbitrary adjustable parameters in the least-squares solutions for the absolute elements of binary systems.

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