Short term tidal and third body perturbations in close hierarchical triple stellar systems

Details Short term tidal and third body perturbations in close hierarchical triple stellar systems Short term tidal and third body perturbations in close hierarchical triple stellar systems

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004padeu..14..207b&link_type=abstract

In: Proceedings of the British-Hungarian N+N Workshop for Young Researchers On Computer processing and use of satellite data in

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

We introduce our first results with a new numerical integrator which was developed for studying the orbital and spin evolution of hierarchical triple stellar systems. (The code includes equilibrium tide approximations with arbitrary direction of rotational axes.) The variation of the orbital elements (e.g. the inclination of the close-eclipsing-binary) and its observational consequences according to the distorted models with different mass-distributions of the stars, as well as with and without dissipation is studied in the case of the well-known eclipsing triple system Algol. We found that in lack of the stellar dissipation, the presence of the third star may cause sudden fluctuations in the orbital elements and the stellar rotation of the binary members even in the previously synchronized case, too. The dissipation can eliminate these fluctuations, nevertheless some variations which would produce observable effects in the same order which have been measured in several eclipsing binaries are also present. We also studied the perturbations of a hypothetical third companion on the eccentric eclipsing binary AS Cam. We found that the complex influence of the variation of the orbital elements on the occurence of the minima events can make it impossible to obtain the real apsidal motion rate from an O--C curve which covers only a small fraction of the period of the rotation of the apsidal line.

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