Other
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96..741l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 96, Aug. 1988, p. 741-746.
Other
9
Binary Stars, Irregular Variable Stars, Light Curve, Starspots, Limb Darkening, Stellar Luminosity, Stellar Models, Taurus Constellation
Scientific paper
A two-component doublespot model to explain the variations in the light curves of RS CVn binaries is described. In analogy with large sunspots, each spot is divided into an umbra and a penumbra, with temperatures Tu and Tp, respectively. In addition, the size and location of each spot can be assigned independently. The parameters of the model are adjusted to fit the observed light curves of the RS CVn variable V711 Tau at either 6585 A or in the V band at a particular epoch. These parameters are then used to predict the amplitudes and light curves at other wavelengths for that epoch. The model is compared with the standard one-component model (Tu = Tp) over several epochs. From this comparison, it is found that the two models can possibly be distinguished using observations at low optical wavelengths. An important feature of the present model is that spots of approximately constant areas were found to fit light curves over several years, implying that different light curves probably result from migration of spots over latitude and longitude rather than from changes in the sizes of the spots.
Lodenquai J.
McTavish J.
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