Gravity Darkening in the Components of Close Binary Systems
Abstract
The variation of temperature and brightness on the surface of the components of close binary systems has been investigated taking account of non-uniform rotation and tidal effects of the other component considered as mass pomt. The equations for such surfaces had been developed in terms of the mass ratio of the two components (m3/m1); ratio of the equatorial radius of the primary to the distance between the centers of gravity of the two components (re/B); ratio of centrifugal to gravity forces at the equator (1); and the ratio of angular velocities at the equator and the pole (x). When these equations are used to compute the temperature and brightness distributions by using different values for the above mentioned parameters, it has been observed that temperature and brightness fall very rapidly between 45 colatitude and the equator. Higher temperatures tend to reduce gravity darkening due to tidal effect. The fall in brightness is steeper than that of temperature. These results are compared with those of Ireland by putting m3 = 0.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 1969
- Bibcode:
- 1969A&A.....3..163P