Photospheric and Chromospheric Active Regions in Four Young Solar‐Type Stars
Open Access
- 10 February 2007
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 656 (1), 474-482
- https://doi.org/10.1086/510279
Abstract
We present a photometric and spectroscopic study of four G-K dwarfs, namely HD 166, epsilon Eri, chi1 Ori and kappa1 Cet. In three cases, we find a clear spatial association between photospheric and chromospheric active regions. For chi1 Ori we do not find appreciable variations of photospheric temperature, and chromospheric Halpha emission. We applied a spot/plage model to the observed rotational modulation of temperature and flux to derive spot/plage parameters and to reconstruct a rough three-dimensional map of the outer atmosphere of kappa1 Cet, HD 166 and epsilon Eri.Keywords
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