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Issue A&A Volume 396, Number 1, December II 2002 Page(s) 203 - 211 Section Formation, structure and evolution of stars DOI 10.1051/0004-6361:20021424

A&A 396, 203-211 (2002)
DOI: 10.1051/0004-6361:20021424

Starspots and active regions on the emission red dwarf star LQ Hydrae

I. Yu. Alekseev and O. V. Kozlova

Crimean Astrophysical Observatory, P/O Nauchny, 98409 Crimea, Ukraine Isaac Newton Institute of Chile, Crimean Branch, Ukraine
(Received 19 October 2001 / Accepted 26 September 2002 )

Abstract
The quasi-simultaneous electrophotometric, polarimetric and spectroscopic observations of the single active spotted star LQ Hya are presented. The photometric variability of the star can be described completely by a zonal starspots model. Spotted regions occupy up to 23% of the total stellar surface. The temperature difference between the unspotted photosphere and starspots is about 800 K. Starspots are localized at the low and middle latitudes. We find for the first time broad-band linear polarization of the stellar light and its rotational modulation connected to the local magnetic region on the stellar surface. We suspect that there is a spacial connection between plages, magnetic regions and the mostly spotted stellar longitudes.

Key words: stars: activity -- stars: chromospheres -- stars: magnetic fields -- starspots

Offprint request: I. Yu. Alekseev, ilya@crao.crimea.ua

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