Search for Proton Acceleration in Flare Stars - AU MIC - Repeat for HOPR#0028

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Hst Proposal Id #4214 Stellar Astrophysics

Scientific paper

We propose to search for energetic protons in stellar flares, by monitoring the stellar H Lyman alpha profile with high time resolution. Protons accelerated in a flare may dominate the total energy released, but have not previously been observed below 1 Mev. In the impulsive phase, predictions show that some of the 10-300 kev protons accelerated down into the stellar chromosphere will charge-exchange with neutral hydrogen and emit Lyman alpha photons in the red wing, up to 20a from line center. Impulsive bursts may last from 0.5- 30 sec, spread over several minutes. Simultaneous observations of transition region, chromospheric, and coronal lines will identify the impulsive phase, and provide measurements of the emission measure, temperature distribution, and density. In this rerun of previously failed observations, approximately 4 hours of exposure time (6 hours of S/C time) with GHRS in medium resolution mode (R= 20000), covering the 1198-1234 A region with 0.4 sec time resolution are required.

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