Density Diagnostics for the Dynamic Atmospheres of LPV Stars

Details Density Diagnostics for the Dynamic Atmospheres of LPV Stars Density Diagnostics for the Dynamic Atmospheres of LPV Stars

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6620l&link_type=abstract

HST Proposal ID #6620

Computer Science

Hst Proposal Id #6620 Cool Stars

Scientific paper

We propose to use the GHRS onboard HST to probe thetemperature--density structure of the shocked atmospheres oflong-period variable (LPV, Mira--type) stars. At 3 selectedphases, we wish to obtain GHRS spectra of the C II multipletnear Lambda2325 and the Mg II h & k lines near Lambda2800 for2 bright Mira stars, R Leo and R Hya. With these spectra, wewill make comparisons (1) with previous GHRS and IUE spectraof the semiregular variable g Her, in order to investigate thedifferences in the atmospheric structures of these 2 variabletypes, and (2) to synthetic spectra from representativedynamic models we have generated. These NLTE radiativetransfer calculations have shown that the radiation field ofthe inner shocks dominate the ionization throughout the entireatmosphere. The calculations also have shown the C IIintersystem lines are the best diagnostic to supply electrondensity information of the inner shock region, the first timesuch a diagnostic has been measured for these stars. Finally,it is imperative to obtain high--dispersion spectra of theC II and Mg II lines in Miras before GHRS is decommissioned,since comparisons of such spectra to similar spectra obtainedfor semiregulars are fundamental in the understanding of massloss in this critical stage of a star's evolution.

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