Broad-band Multicolor Photometry and Polarimetry of Spotted Stars

Details Broad-band Multicolor Photometry and Polarimetry of Spotted Stars Broad-band Multicolor Photometry and Polarimetry of Spotted Stars

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003arep...47..430a&link_type=abstract

Astronomy Reports, Volume 47, Issue 5, p.430-442

Astronomy and Astrophysics

Astronomy

6

Scientific paper

We have confirmed the BY Dra-type variability of the active spotted stars MS Ser, LQ Hya, VY Ari, and EK Dra using simultaneous UBVRI photometric and polarimetric observations. We have also reliably detected the intrinsic linear polarization of their radiation and its rotational modulation in U due to the inhomogeneous distribution of active magnetized regions over the surfaces of the stars. Modeling of the linear polarization based on the Zeeman effect indicates that all the stars display strong local magnetic fields (about 2 kG, similar to those in sunspots), with filling factors of up to 40% of the total stellar surface. The magnetized regions coincide with cool photospheric spots detected in photoelectric observations.

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