Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt........17a&link_type=abstract
Ph.D. Thesis, Queen's Univ. of Belfast, (1997)
Other
Starspots, Spotted Stars
Scientific paper
In this work, the main and most important assumption made when modelling star spots via the photometric technique, namely, the evaluation of the spectral flux distributions for the spot and the unspotted photosphere, has been revised. In order to achieve this, new calibrations of fundamental parameters were developed for very late-type stars, where (U-B) and, to a less extent (B-V) for the latest-type RS CVn's, were found to be affected by the level of activity. A FORTRAN code was then constructed using the aforementioned calibrations in order to produce synthetic light and colour curves of spotted stars. The main differences between this and other codes already in existence are the use of the infrared colour (V-K) to assist in the modelling of spots, the new Barnes-Evans-like Fv-(I-K) relation used to determine the fluxes for the spot and unspotted photosphere and the assumption of different surface gravities for the spot and unspotted photosphere. With this code, a study of the light emitted by the spot was undertaken and the differences between various spectral flux distributions examined. Theoretical curves were produced in order to study problematic spot configurations and the code's ability to detect them. Polar spots and equatorial bands of spots were studied, as well as two-component spots. The code was also applied to observed light and colour curves of active stars and spot parameters were derived. Combining two different modelling techniques should make it possible to better constrain those parameters and would help to overcome the limitations inherent to each particular technique. In this work, photometric and TiO spot models were derived and combined for the active star AG Dor.
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