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Astrometric binaries with a variable component

par Halbwachs, Jean-Louis;Pourbaix, Dimitri
Référence ESA SP, 576, page (575-578)
Publication Publié, 2005

Article révisé par les pairs

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Résumé :

We present two models dedicated to unresolved binary systems hosting a photometric variable: the first is the 'VIM' (for Variability Induced Movers) model, which deals with couples of fixed stars. The second consists of the calculation of the astrometric orbit of the so-called 'orbital VIM' systems; in this case, the photometric variability of the system is used to derive the semi-major axis of the orbit of the variable component around the barycentre, instead of the usual photocentric orbit. Additional information about the physical properties of the system are thus obtained.