Starspots and active regions on the chromospherically active binary MS Ser
Crimean Astrophysical Observatory, P/O Nauchny, 98409 Crimea, Ukraine; and Isaac Newton Institute of Chile, Crimean Branch, Ukraine
Corresponding author: I. Yu. Alekseev, firstname.lastname@example.org
Accepted: 28 February 2003
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
© ESO, 2003