Документ взят из кэша поисковой машины. Адрес оригинального документа : http://star.arm.ac.uk/~ambn/abstract221.ps Дата изменения: Wed Aug 14 12:12:45 1996 Дата индексирования: Mon Oct 1 23:36:43 2012 Кодировка: Поисковые слова: m 94

Environments of Active Close Binaries I: ER
Vulpeculae
A.G. Gunn and J.G. Doyle
A&A, in press
High­resolution observations of the eclipsing active close binary system ER
Vulpeculae have revealed excess emission in the Hff, the Ca II IRT and the
Mg I b lines and excess absorption in the He I D 3 line. The emission ap­
pears to be from a global phenomenon with the secondary component the more
active. Analysis has revealed that the emission arises in plage­like material cov­
ering perhaps half of the secondary's surface. This gives credance to X­ray and
UV studies which have indicated that ER Vul is near the saturation limit for
dynamo­induced activity. No firm spectroscopic evidence for the existence of
extended material around ER Vul was found. A consistent velocity offset of 10
km s \Gamma1 was observed in the excess Hff emission from the secondary coompo­
nent which may be associated with active regions such as spicules. If so this
represents the first observation of the equivalent of solar spicule emission in a
stellar system other than the Sun.
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