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Session 21 -- Stellar Spectroscopy, Atmospheres, Models, Intrinsic Variables, Theory, Part I

Display presentation, Tuesday, June 13, 1995, 9:20am - 6:30pm

[21.03] Simultaneous EUVE and IUE Flares from the Flare Star EV Lac

The active dM4.5e flare star EV Lac was observed in September 1993 simultaneously with the IUE and EUVE satellites. One large and three small flares are present in the EUVE Deep Survey coronal light curve. Factor $\sim 4$ enhancements in the C IV $\lambda$1550 transition region light curve are present for both the largest DS flare and a smaller one 17 h later. The C IV increase clearly precedes the DS flare for one, and possibly both, DS events, while Mg II $\lambda$2800 chromospheric enhancements coincide (within errors) with the DS peaks as expected for the gradual phase of a flare. Constraints on the durations and energetics of the flares will be discussed.

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