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: http://star.arm.ac.uk/~ambn/abstract193.html
Дата изменения: Fri Aug 16 13:18:12 1996 Дата индексирования: Tue Oct 2 00:09:57 2012 Кодировка: Поисковые слова: п п п п п п п п п п п п п п п п п |
We present optical, ultraviolet (UV) and extreme ultraviolet (EUV) results
for a new active late-type dwarf star discovered by the Extreme
Ultraviolet Explorer (EUVE). A large flare with an energy in excess of
1E35 erg and duration of ~1.1 days was detected in the EUVE Lex/B band
(60--200AA). The energetics of the event indicate that radiative losses in
the EUV is a significant contributor to the energy budget in stellar
flares. The `quiescent' EUV emission of the source is similar to the most
active flare stars with the `quiescent' optical spectrum showing strong
H alpha, Ca II H&K Mg II h&k emission and Li I 6707.8A absorption. We have
estimated a Li abundance of log N(Li) = 2.5+-0.4. Although the high Li
abundance suggests that EUVEJ2056-17.1 is a young object recently arrived
on the main sequence, the high flare activity favors an interpretation
where the enhanced Li is sustained by spallation reactions.
Key Words:stars: flare--stars: late-type--EUV emission