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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:29 |
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Conference: Bucharest University Faculty of Physics 2001 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
APSIDAL MOTION IN ECLIPSING BINARIES AG PER, EK CEP AND Y CYG
Authors:
Valeriu Tudose 1, Alexandru Dumitrescu 2, Mircea Rusu 1
Affiliation:
1 Faculty of Physics, University of Bucharest
2 Astronomical Institute of the Romanian Academy
E-mail
Keywords:
Abstract:
An eclipsing binary system has two stellar components, which eclipse each other alternately due to their space orientation of the orbit with respect to the line of sight. The two stars will deform each other, and the distortion arises both from their mutual tidal distortion and from their own rotations. An important consequence is a secular change in the position of the periastron, if the orbit is eccentric. This variation of the longitude of periastron with time is referred to as apsidal motion. In addition, there is a contribution to apsidal motion due to general relativity, which is usually much smaller then that arising from the distorted shapes of the stars. When the orbital and stellar properties are accurately known, the observed apsidal motion rate yields a measure of the mass distribution inside the stars. This information can be used to contrast observational data of eclipsing binaries with theoretical predictions of the mass concentration derived from evolutionary models.
In this paper, we calculate the apsidal motion rate for three eclipsing binary systems, namely AG Per, EK Cep and Y Cyg. For the analysis, we have used all the times of minima accessible from literature.
Also we determine the internal structure constant, which can be used further as a complementary test to the stellar evolution theory.
For each system we give new ephemerides.
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