Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7756l&link_type=abstract
HST Proposal ID #7756
Other
Hst Proposal Id #7756 Cool Stars
Scientific paper
This proposal is a carry over from Cycle 6. Four orbits have been allocated to the PI in Cycle 7 to conclude this program. This proposal has been modified from the Cycle 6 proposal to reflect the change in instruments from GHRS to STIS. We propose to use the STIS onboard HST to probe the temperature-density structure of the shocked atmospheres of long-period variable {LPV, Mira-type} stars. We wish to obtain STIS echelle spectra in order to obtain the C II multiplet near 2325A and the Mg II h & k lines near 2800A for the bright Mira-type star R Leo near maximum UV brightness {optical phase 0.42}. The echelle spectrum also will give us access to other important emission features such as Fe I and Fe II. With this spectrum, we will make comparisons {1} with previous GHRS and IUE spectra of the semiregular variable g Her, in order to investigate the differences in the atmospheric structures of these 2 variable types, and {2} to synthetic spectra from representative dynamic models we have generated. These NLTE radiative transfer calculations have shown that the radiation field of the inner shocks dominate the ionization throughout the entire atmosphere. The calculations also have shown the C II intersystem lines are the best diagnostic to supply electron density information of the inner shock region, the first time such a diagnostic has been measured for these stars. These spectrum comparisons are fundamental in the understanding of mass loss in this critical stage of a star's evolution.
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