Spots and active regions on the red dwarf star EV Lac

Astronomy and Astrophysics – Astronomy

Scientific paper

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Chromosphere, Photosphere, Red Dwarf Stars, Starspots, Stellar Activity, H Alpha Line, Stellar Luminosity, Stellar Spectra, Stellar Temperature

Scientific paper

Quantitative characteristics of surface inhomogeneities at the photospheric and chromospheric levels on EV Lac in 1986 and 1987 are given. A new method for estimating the temperature and area of starspots which determines their temperature independently of their geometry is proposed. While the total area of starspots changes by a factor of 2-3, estimates of their temperature are virtually unchanged. It is argued that large dark starspots in circumpolar zones may be a model-dependent result and may not correspond to the true starspot picture.

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