Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8129r&link_type=abstract
HST Proposal ID #8129
Physics
Hst Proposal Id #8129 Cool Stars
Scientific paper
We propose to use STIS to obtain rapid time sequence spectra of stellar flares. The proposed observations will cover the wavelength range 2303-3111 Angstrom, which includes the expected peak of the continuum emission from the flare, numerous Fe II lines and the Mg II resonance lines, as well as the majority of the energy radiated in the UV/optical portion of the spectrum. This radiation is produced by the heating of the upper photosphere and/or chromosphere by energy propagating downward from the site of the original energy release in the lower corona. Groundbased photometry has shown that during the explosive phase of a stellar flare the continuum can change drastically on time scales of seconds or less. At present there is virtually no UV data with time resolutions capable of resolving these variations. With the proposed data we hope to study the variation of the continuum shape during the flare and thereby obtain some understanding of how and where the continuum is formed . Further, in conjunction with con temporaneous radio, optical and X-ray data, we hope to provide constraints on theoretical models of energy transport and flare dynamics.
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