The gravity-darkening of highly distorted stars in close binary systems. IV. Practical analysis of secondary components filling the Roche lobe in semi-detached systems.
Abstract
From a quantitative analysis of the observed photometric ellipticity effect, the exponent of gravity-darkening has been empirically determined for the secondary components filling the Roche lobe in nine well-understood semi-detached close binary systems. In the analysis, the exponent of gravity-darkening for the main-sequence primaries with spectral types of B1 V - A2 V has been assumed as the unity. The result of the present analysis indicates that the empirical values of the exponent deduced for the secondary components are significantly greater than the unity. Such greater values of the exponent for the secondaries could not be reconciled by any adjustment of the physical elements used as the input parameters within the extent of reduction errors.
- Publication:
-
Annals of the Tokyo Astronomical Observatory
- Pub Date:
- 1987
- Bibcode:
- 1987AnTok..21..387K
- Keywords:
-
- Binary Stars;
- Computational Astrophysics;
- Stellar Gravitation;
- Stellar Spectrophotometry;
- Darkening;
- Main Sequence Stars;
- Astronomy;
- Close Binaries:Gravity Darkening;
- Close Binaries:Roche Lobes;
- Close Binaries:Semi-Detached Systems;
- Gravity Darkening:Close Binaries;
- Roche Lobes:Close Binaries;
- Semi-Detached Systems:Close Binaries