Statistics – Computation
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1837l&link_type=abstract
IUE Proposal ID #CSGJL
Statistics
Computation
Scientific paper
We propose to use both archival and new seventh-year high resolution IUE spectra to investigate the cool, extended winds around a sample of late-type giant and supergiant stars. The primary goals of this study are to determine for each star the radial structure of its wind, the primary channels for radiative cooling of its outer atmosphere, and the density and geometrical extent. of its wind. We shall also examine the long-term stability of the wind in a subset of these same stars. The density and geometrical extent of the winds will be estimated from the C II intercombination emission lines near 2325 A., using an improved version of the technique developed by Stencel et al. (1981). Fluxes of the Fe II emission lines, found throughout the long-wavelength region of IUE, will be used in a probability-of-escape modelling of the wind structure. The range of opacities and temperature sensitivities represented by the numerous Fe II lines will allow the computation of models with much greater radial discrimination than is possible solely on the basis of the frequently used Mg II or Ca II resonance lines. The acquisition of wavecal images immediately after each new high resolution spectrum will also allow us to measure very accurate absolute radial velocities of the emission features and thus to determine the speed and radial dependence of the material in the outer layers of these stars.
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