Elemental Abundances in Early-Type Stars -- Cycle 1

Details Elemental Abundances in Early-Type Stars -- Cycle 1 Elemental Abundances in Early-Type Stars -- Cycle 1

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.3207l&link_type=abstract

HST Proposal ID #3207

Physics

Atomic Physics

Hst Proposal Id #3207

Scientific paper

The resolving power and photometric quality of GHRS data are exploited in an investigation of the elemental abundances, atmospheric properties and evolutionary characteristics of sharp-lined B and A stars. Three classes of stars are included in the overall program - chemically peculiar (CP) non-magnetic late B stars of the HgMn class, early A-type horizontal branch stars and sharp-lined normal stars ranging from B6 to A2. The Cycle 1 segment of this program continues the systematic study of anomalies in the abundance of Hg and in the mixture of Hg isotopes. Abundances of Hg derived from lines of Hg I, II, and III in the relatively hot Hg-rich star, kappa Cnc, will be used to test diffusion-theory models for the production of abundance and isotope anomalies. The Hg abundance of the normal A1 star, Sirius, will be derived. Abundances of many other species with lines in the observed intervals will also be obtained. A "standard" spectral interval in Sirius, of considerable interest for atomic physics, is included in the program.

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