Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...366..202o&link_type=abstract
Astronomy and Astrophysics, v.366, p.202-209 (2001)
Astronomy and Astrophysics
Astrophysics
9
Star: Binaries: Spectroscopic, Stars: Rs Cvn, By Dra Binaries, Stars: Late Type, Stars: Chromospheres Of Stars: Magnetic Fields
Scientific paper
High-resolution spectroscopic observations of the eclipsing RS CVn-type active close binaries SV Camelopardalis and XY Ursae Majoris reveal excess emission components in the Hα and Hβ lines. We have used the spectral subtraction technique to separate the excess emission from the photospheric background and find that in both stars the excess emission is associated with the secondary, cooler component. Analysis of the EWHα/EWHβ ratio indicates that in both cases the emission is probably associated with surface plage regions or prominences viewed against the stellar disks. We find no evidence of excess absorption features associated with extended prominence-like material in these systems. Based on observations made at Observatoire de Haute Provence (CNRS), France.
Doyle Gerry J.
Gunn Alastair G.
Jevremovic Darko
Özeren Ferhat Fikri
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