Flares and active sectors on YY Geminorum

Details Flares and active sectors on YY Geminorum Flares and active sectors on YY Geminorum

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..181b&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 181-18

Astronomy and Astrophysics

Astrophysics

Binary Stars, Flare Stars, H Beta Line, Stellar Activity, Stellar Flares, Iue, Stellar Rotation, Stellar Spectra, Ultraviolet Spectra

Scientific paper

With IUE ultraviolet and Hβ emission spectra obtained during one week, the authors have mapped the atmospheric activity on the component stars of YY Gem (dM1e+dM1e, P = 19h.5) as a function of orbital and rotational phases. They have observed several flares in Hβ on both component stars, as well as two flare-like brightenings in the ultraviolet. The behavior of the line ratios of the C II, C IV, and He II features is similar to that of solar surges during the ultraviolet brightenings. The spatial extent of the ultraviolet phenomena is likely small. In the ultraviolet and visible, certain phases or areas of the stars are apparently more active than others.

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