Measuring starspot temperature from line-depth ratios. II. Simultaneous modeling of light and temperature curves

Details Measuring starspot temperature from line-depth ratios. II. Simultaneous modeling of light and temperature curves Measuring starspot temperature from line-depth ratios. II. Simultaneous modeling of light and temperature curves

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...432..647f&link_type=abstract

Astronomy and Astrophysics, Volume 432, Issue 2, March III 2005, pp.647-655

Astronomy and Astrophysics

Astrophysics

21

Stars: Activity, Stars: Late-Type, Stars: Individual: Vy Ari, Hk Lac, Im Peg, Techniques: Spectroscopic

Scientific paper

We present and apply to VY Ari, IM Peg and HK Lac a new method to determine spot temperatures (Tsp) and areas (Arel) from the analysis of simultaneous light curves and temperature modulations deduced from line-depth ratios. A spot model, developed by us, has been applied to light and temperature curves. Grids of solutions with comparable χ-square have been found for a wide range of spot temperatures. The behavior of the solution grids for temperature and light curves in the Tsp-Arel plane is very different and a rather small and unique intersection area can be found. In our spot-model we used spectral energy distributions (SEDs) based on the Planck law and on model atmospheres to evaluate the flux ratio between spots and unspotted photosphere and we found higher spot temperatures with SEDs based on model atmospheres than on the Planck law.
Based on observations collected at Catania Astrophysical Observatory, Italy. Appendix A is only available in electronic form at http://www.edpsciences.org

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