Computer Science – Sound
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4611b&link_type=abstract
HST Proposal ID #4611
Computer Science
Sound
Hst Proposal Id #4611
Scientific paper
Our previous IUE programs to study the evolution of the shock structure of Miras have produced high-dispersion spectra of the highly variable Mg II h and k emission lines. These lines possess unusual properties that appear to be common among Miras, including strong variability on timescales as short as 2 days, and emission centroids that are shifted relative to the stellar radial velocity well in excess of the presumed wind or shock velocity. We propose to obtain a series of closely-spaced high dispersion Mg II observations to (i) constrain the short timescale (hours to days) behavior of these lines; with the possibility of determining whether sound waves -- as opposed to radiation pressure on dust -- are contributing to the mass loss and (ii) probe the radiative transfer effects in a multiply shocked atmosphere, which will provide unique observational inputs to the newly emerging class of theoretical radiative transfer problems of resonance line transfer (including partial redistribution) across shock fronts. This investigation into the dynamic structure of extended stellar atmospheres is part of the broader question of mass loss in evolved cool stars and their influence on the ISM.
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