MULTIPLE STARSPOTS AND THE SOLAR ANALOGY - A NEW APPROACH AND APPLICATIONS TO HD-12545
ASTROPHYSICAL JOURNAL, vol.445, no.2, pp.526-536, 1995 (SCI-Expanded)
- Publication Type: Article / Article
- Volume: 445 Issue: 2
- Publication Date: 1995
- Doi Number: 10.1086/175718
- Journal Name: ASTROPHYSICAL JOURNAL
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.526-536
- Keywords: STARS, ACTIVITY, STARS, INDIVIDUAL (HD 12545), II-PEGASI, PHOTOMETRIC VARIATIONS, LIGHT CURVES, AB-DOR, RS, SPOTS, TEMPERATURES, HD-12545, BINARIES, HD-26337
- Akdeniz University Affiliated: No
Abstract
An improved method for the modeling of light curves of spotted stars is presented. This method still operates by trial and error but assumes numerous spots, unlike the other classical light-curve solutions of one-spot or standard two-spot models. The symmetry implied by the solar analogy, which describes the distribution of spots, helps reduce the number of free parameters. Automatic iterations converge to a unique solution of spot parameters (temperature, sizes, and locations) to produce theoretical light curves fitting the five-color photometry (UBVRI) of HD 12545. The spot temperature is treated as a free parameter simultaneously with the sizes and locations, unlike other models which usually predict it from V-I or V-R color curves prior to the trials. The spots are found to be 1280 K cooler than the T-eff = 4820 K of this cool giant and to cover similar to 27% of the total surface at +/- 18 degrees away from the equator.