Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.1177l&link_type=abstract
HST Proposal ID #1177
Other
Hst Proposal Id #1177
Scientific paper
We will measure the amount of plasma hotter than 10,000 K (or establish small upper limits) in the outer atmospheres of K giant stars now thought not to have for hot material. A second goal is to derive models of the hot plasma in the transition regions of early K giants with very low heating rates due to slow rotation and very weak magnetic field generation. We will search for emission lines of C III, Si III, C IV, Si IV, and N V in very deep specta. Upper limits to the strength of these emission lines will place stringent constraints on possible nonradiative heating processes. Observations of weak intersystem lines will provide estimates of the electron density needed for atmospheric modeling. We will attempt to determine whether the hot plasma (and the required heating) are global or isolated to small regions on the star due to magnetic fields or stochastic heating processes. Two of these stars are Hyades Cluster giants, one with no evidence of hot lines and the other with strong emission lines that may be due to the presence of a close binary component.
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