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

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

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.310..377a&link_type=abstract

Monthly Notices, Volume 310, Issue 2, pp. 377-386.

Astronomy and Astrophysics

Astronomy

11

Stars: Activity, Binaries: Eclipsing, Stars: Chromospheres, Stars: Individual: Cf Tuc, Stars: Late-Type

Scientific paper

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.

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