Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..194s&link_type=abstract
Astronomy and Astrophysics 286, 194-202 (1994)
Astronomy and Astrophysics
Astrophysics
6
Polarization, Stars: Flare, Stars: Magnetic Field, Stars: Bd +26 730, Stars: Late-Type, Stars: Activity
Scientific paper
We present broadband linear polarization measurements of the active dK5e flare star, BD +26 730, which show a rapid change in polarization amplitude and direction over a two hour period. We conclude that impact polarization resulting from flare-generated particle beams is the most likely cause of the polarization variations. If this interpretation is correct, this event represents the most direct evidence to date for flare-generated particle beams in a star other than the Sun. With proton beams as the most probable source, energy fluxes of the order of 10^9-10^ erg/cm2/s are required to power the observed polarization changes. Using the non-flare polarization level (likely produced by stellar magnetic regions) and simple models, we estimate a lower limit of 7% for the inhomogeneous component of the magnetic region area filling factor. We compare our results with solar flares and suggest future observational and theoretical efforts.
Huovelin Juhani
Linnaluoto S.
Martens Petrus C. H.
Saar Steven H.
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