Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.232..763c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 232, June 15, 1988, p. 763-770.
Astronomy and Astrophysics
Astronomy
23
Cosmochemistry, Iue, Peculiar Stars, Rare Earth Elements, Stellar Composition, Stellar Spectra, Ultraviolet Spectra, A Stars, Abundance, Line Spectra, Spectrum Analysis, Stellar Models
Scientific paper
Third spectra of the lanthanides can be identified in IUE spectra of certain chemically peculiar (CP) A stars with the help of statistical techniques. These spectra are rather weak. The intrinsically strongest lines are probably only a few tens of mA in equivalent widths, and the detections are perhaps best described as marginal. There is no doubt, even in the lanthanide-strong Ap stars, that the iron group, and not the rare earth spectra, dominate the line absorption in the satellite ultraviolet. Provisional, quantitative estimates of abundances are made that are based on the third spectra, but in view of the severe blending, uncertainties in the stellar model, and the lack of gf-values, definitive results cannot be made at this time.
Cowley Charles R.
Greenberg Marcella
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