Theoretical Light Changes in Close Binaries
Abstract
A general expression for the gravity darkening of the tidally and non-uniformly rotating Roche components of close binary systems has been derived. This expression has been used to ealculate the temperatures and spectral distributions on the surfaces of these components and to compute their luminosities with limb-darkening taken into account. The effects of uniform and non-uniform rotation have been considered together with a few cases of synchronous rotation. The distributions, especially that of temperature are relatively insensitive to the amount of non-uniformity of the rotation. The laws of darkening tend to converge as the mass ratio increases. The results for synchronous rotation of the components a not very different from those found for nonsynchronous systems. Luminosities can be reduced by as much as 40 to 50 percent of the total luminosities in different directions depending upon the line of sight.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1970
- Bibcode:
- 1970A&A.....7..473P