Period changes of the sample of eclipsing binaries with active chromospheres

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Publikace nespadá pod Pedagogickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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JABLEKA D. ZOLA Stanislav ZAKRZEWSKI B. SZYMANSKI T. KUZMICZ A. DE VILLIERS S. N. ZEJDA Miloslav KOZIEL-WIERZBOWSKA D.

Rok publikování 2012
Druh Článek v odborném periodiku
Časopis / Zdroj Advances in Astronomy and Space Physics
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Obor Astronomie a nebeská mechanika, astrofyzika
Klíčová slova stars: binaries: eclipsing; stars: magnetic field; stars: chromospheres
Popis In this work we present results derived from analysis of the O-C behaviour of ten eclipsing binary systems: AR Lac, CG Cyg, HP Aur, MM Her, RS CVn, RT And, SV Cam, V471 Tau, WW Dra and CF Tuc. It was proved on the basis of moments of minima compiled from the literature and new ones determined from recent observations, that these binaries show long term (19-91 years) modulations of their orbital periods, clearly visible in their O-C diagrams. Two possible explanations for this effect are considered: (1) the light-travel time effect due to the presence of a third body orbiting the eclipsing systems; (2) the Applegate mechanism predicting period modulation by changes in the distribution of angular momentum as a star goes through its activity cycles. It was found that in the case of four systems the existence of a third star, orbiting the binary, is a more plausible explanation of observations.
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