Observations of active-chromosphere stars - V. A photometric study of the RS CVn system CF Tuc (HD 5303)

Autor:	D. W. Coates, Keith L. Thompson, J L Innis, Greg Anders
Rok vydání:	1999
Předmět:	Physics Stars Light level Space and Planetary Science K-type main-sequence star Astronomy Astronomy and Astrophysics Astrophysics Binary system Star (graph theory) Light curve Orbital period Chromosphere
Zdroj:	Monthly Notices of the Royal Astronomical Society. 310:377-386
ISSN:	1365-2966 0035-8711
Popis:	The Wilson–Devinney program is used to model 27 light curves (our own and others) for CF Tuc. We find new parameters for the binary system, and estimate the longitudes and radii of the spots on the cooler secondary star. We also find a strong tendency for spots on the cooler star to appear in a limited range of longitudes, rather than to migrate fairly rapidly as for other RS CVn systems. There is evidence that the mean light level of the cooler star is varying cyclically. The orbital period clearly changes discontinuously. We discuss this, and the apparently cyclic variations in mean light level, in relation to the model proposed by Applegate.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0edc543f280d2f470323390f622ee8e7 https://doi.org/10.1046/j.1365-8711.1999.02986.x Zobrazit plný text záznamu Plný text