Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6676s&link_type=abstract
HST Proposal ID #6676
Other
Hst Proposal Id #6676 Cool Stars
Scientific paper
The question of the contribution of flares and microflares tothe non-radiatively heated outer atmospheres of late-typestars has been studied with very limited success for over adecade using IUE, a variety of X--ray satellites, and ground-based studies. HST presents the best opportunity to place afirm lower limit on the fraction of the transition region fluxresulting from short timescale events. Our analysis of HSTdata on one M dwarf shows that up to 60% of the transitionregion flux is directly attributable to stellar flares andmicroflares. This leaves little room for the traditional``quiescent" emission. Such a result, if confirmed for otherstars, promises to revitalize the study of their outeratmospheres, with the recognition that they are far moredynamic than static. We now propose to observe two active,evolved stars to probe the importance of flare heating intheir outer atmospheres: the RS CVn binary II Peg, and FKComae, a rapidly rotating single giant (possibly the result ofa coalesced binary). It is important to make theseobservations before STIS, since the even moderate flares onthese stars could saturate the MAMA detectors in strong lines.
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