Other
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216..743m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Oct. 1, 1985, p. 743-752.
Other
10
Cool Stars, Heavy Elements, Neutrons, Peculiar Stars, Stellar Composition, Stellar Evolution, Abundance, Exponential Functions, High Dispersion Spectrographs, Nuclear Fusion, Nuclear Reactions, Spectral Line Width, Stellar Spectra, Variable Stars
Scientific paper
With regard to the search for an explanation on the origin of the peculiar cool R CrB star U Aquarii, it is important to determine whether the observed heavy element enhancements are due to a single neutron exposure as previously suggested, or to a series of exponentially weighted exposures. High-dispersion spectra of U Aquarii were obtained in order to investigate this. The Sr and Y enhancements are found to be lower than previously believed. Zr is found to be slightly overabundant, but no significant enhancement of Ba is detected. It is shown that a weak exponentially weighted distribution of neutron exposures characterized by τ0 ≡ 0.1 mb-1 can, within the observational uncertainties, represent these enhancements. The implications of these results to theories regarding the origin of U Aquarii and other R CrB stars is discussed.
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