Other
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8613h&link_type=abstract
HST Proposal ID #8613
Other
Hst Proposal Id #8613 Cool Stars
Scientific paper
We will obtain high resolution HST/STIS spectra of the dMe star AD Leo during periods of quiescence and during flares to study the physics of atmospheric heating in flare stars. The HST observations will form an essential part of a large, coordinated observing campaign including FUSE, EUVE, and ground-based observations {both multicolor photometry and high resolution optical spectroscopy}. The STIS spectra, in combination with data from the other satellites, will allow us to determine the structure {during quiescence} and evolution {during flares} of the temperature and density in the corona, transition region, and chromosphere. These data will provide strong empirical constraints on our current generation of flare evolution models. The uniquely high spectral resolution of the STIS data will also allow us to directly observe the dynamic effects of the chromospheric shocks that are predicted by the models. In addition, we will search for significant red-shifted emission in the hydrogen Lyman-Alpha line during the flare rise phase, which is a signature of an energetic proton beam. The existence and role of proton beams in both solar and stellar flares is currently a subject of considerable debate.
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