The effect of stellar wind on the stability of triple systems

Astronomy and Astrophysics – Astronomy

Scientific paper

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Celestial Mechanics, Stellar Dynamics, Binaries: General

Scientific paper

The dynamical evolution of hierarchical triple systems is considered. The effects of mass loss via stellar wind on the stability of triple systems, with respect to violation of the hierarchical structure and escape of the distant component without exchange, are studied. Plane triple systems with initially circularly orbiting inner and outer binaries are investigated. The directions of the revolutions of both binaries coincide. Triple systems with main-sequence components, and also those with red giants, are considered. It is shown that in both cases there is an increase in the stability of the triple systems with respect to violation of the hierarchical structure. A trend towards stability loss, with respect to the escape of the distant component without violation of hierarchy, is present only in the case when the mass of this component is less than the combined masses of the binary system components. The typical times over which the stability measures vary are comparable with the evolutionary times. The effects of stellar wind on the stability of triple systems with respect to violation of the hierarchy can be estimated analytically, using the representation of the triple system as a superposition of two binaries. As for stability with respect to the escape of the distant component which has not undergone previous exchange, the analytical results are an overestimate.

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