Free access article

A&A 403, 205-215 (2003)
DOI: 10.1051/0004-6361:20030308

Starspots and active regions on the chromospherically active binary MS Ser

I. Yu. Alekseev and O. V. Kozlova

Crimean Astrophysical Observatory, P/O Nauchny, 98409 Crimea, Ukraine; and Isaac Newton Institute of Chile, Crimean Branch, Ukraine
(Received 27 November 2002 / Accepted 28 February 2003)

Abstract
The quasisimultaneous electrophotometric, polarimetric and spectroscopic observations of the chromospherically active binary MS Ser are presented. The photometric variability of the star can be described completely by a zonal spottedness model. Spotted regions occupy up to 21% of the total stellar surface. The temperature difference between the unspotted photosphere and starspots is about 1300 K. Starspots are localized at the middle latitudes. We detected the broad-band linear polarization of the stellar light and its rotational modulation connected with the local magnetic region on the stellar surface. We suspect that there is a space connection between plages, magnetic regions and the mostly spotted stellar longitudes.

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

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

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