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Polarimetry of Stellar Active Regions and Flares

Published online by Cambridge University Press:  12 April 2016

I. Tuominen ,
J. Huovelin ,
Yu. S. Efimov ,
N. M. Shakhovskoy  and
A. G. Shcherbakov
I. Tuominen
Affiliation:
Observatory and Astrophysics Laboratory, University of Helsinki, Tähtitorninmäki, SF-00130 Helsinki, Finland
J. Huovelin
Affiliation:
Observatory and Astrophysics Laboratory, University of Helsinki, Tähtitorninmäki, SF-00130 Helsinki, Finland
Yu. S. Efimov
Affiliation:
Crimean Astrophysical Observatory, P/O Nauchny, SU-334413 Crimea, U.S.S.R.
N. M. Shakhovskoy
Affiliation:
Crimean Astrophysical Observatory, P/O Nauchny, SU-334413 Crimea, U.S.S.R.
A. G. Shcherbakov
Affiliation:
Crimean Astrophysical Observatory, P/O Nauchny, SU-334413 Crimea, U.S.S.R.

Abstract

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Observations of regular and irregular polarimetric variability in late-type stars are reviewed, and the related physical and geometrical effects are discussed. There are indications that the irregular part of the variability could be caused by transient events, possibly associated with flares. Polarimetric observations during flares are reviewed, and preliminary results of new observations of a well-known flare star, YY Geminorum, are presented. The results show that the small flare in YY Gem did not cause any significant variations in linear polarization, while the binary eclipse evidently causes an enhancement in the polarization. The reasons for the difficulties in stellar flare polarimetry are discussed. Finally, future prospects for the observations of flaring stars and for the utilization of linear polarimetry as a complementary method to other techniques of surface imaging of stellar activity and flares are presented.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 104 , Issue 1: Solar and Stellar Flares , 1989 , pp. 419 - 429
Copyright
Copyright © Kluwer 1989

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