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2004ApJS..155..179A - Astrophys. J., Suppl. Ser., 155, 179-189 (2004/November-0)
Heavy element abundances in late-B and early-A stars. I. Co-added IUE spectra of HgMn stars.
ADELMAN S.J., PROFFITT C.R., WAHLGREN G.M., LECKRONE D.S. and DOLK L.
Abstract (from CDS):
The International Ultraviolet Explorer (IUE) satellite collected spectra of bright stars for which chemical peculiarities have been derived from ground-based data. For several elements the abundance enhancements have only been recently measured using Hubble Space Telescope data and have therefore not yet been exploited in the IUE data. We have initiated a program to analyze IUE high-dispersion spectra to more fully characterize the pattern of very heavy element enhancement for many mercury-manganese (HgMn) stars and to potentially extend the spectral class (effective temperature) boundaries over which these abundance anomalies are known to exist. The abundances of very heavy elements in chemically normal B and A-type stars provide a base level that may be compared with the solar system abundances. These early spectral type stars may therefore reveal clues for galactic chemical evolution studies since they were formed at a later epoch than the Sun in the history of the Galaxy. This first paper presents the motivation for the analyses to follow, outlines our spectral co-addition technique for IUE spectra, and discusses the choice of model atmospheres and the synthetic spectrum procedures, while initiating the study by highlighting the abundance of gold in several HgMn stars.
Abstract Copyright: ∼
Journal keyword(s): Stars: Abundances - Stars: Chemically Peculiar - Ultraviolet: Stars
Simbad objects: 50
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