Computer Science
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.1182l&link_type=abstract
HST Proposal ID #1182
Computer Science
Hst Proposal Id #1182
Scientific paper
The resolving power and photometric quality of HRS data are exploited in an extensive investigation of the elemental abundances, atmospheric properties and evolutionary characteristics of sharp-lined B and A stars. Three classes of stars are included - chemically peculiar (CP) non-magnetic late B stars of the HgMn class, an early-A type horizontal branch star and sharp-lined normal stars ranging from B6 to A2. Analyses of the CP stars will establish constraints on models for the production of abundance anomalies. The field horizontal branch star's CNO abundances, obtained from low-excitation UV lines, will provide a critical check of abundances derived from high excitation transtions observed in the red and near-IR, the latter being susceptible to large non-LTE effects. Abundances obtained from the spectra of the normal stars provide a framework of comparison standards for the study of CP stars and allow us to place limits on star-to-star variations in abundance, perhaps reflecting local patterns of nucleosynthesis. The program is divided into seven research topics. The R=100,000 mode is used to investigate specific issues raised by previous studies. The R=20,000 mode is used to obtain complete UV spectra of selected CP and normal stars to be used for global abundance analyses.
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