Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6087w&link_type=abstract
HST Proposal ID #6087
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #6087 Hot Stars
Scientific paper
The chemically peculiar stars of the upper main sequence display a deficiency in their ultraviolet flux relative to normal composition stars of similar UBV color. The source of this deficiency is as yet unknown, but has been speculated to arise from enhanced line and continuous opacity from overabundant elements, particularly the iron-peak and rare- earths, as well as to abnormal atmospheric structure. A high signal-to-noise, medium-resolution spectrum of the prototypical Ap star Alpha^2 CVn, covering the wavelength region from 1510 to 2640 Angstrom, will be obtained with the GHRS to determine the extent to which line and continuous opacity sources are responsible for the flux deficiency. The role of weak lines and overabundant species in the flux deficiency, in particular the rare earth elements, will be defined. This data set would represent the first substantial spectrum of an Ap star obtained with the HST and will be used as a `roadmap' by both astronomers and atomic spectroscopists for the study of rare-earth element lines in the ultraviolet.
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