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Abundances of s-process elements in planetary nebulae: Br, Kr & Xe
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Abundances of s-process elements in planetary nebulae: Br, Kr & Xe
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We identify emission lines of post-iron peak elements in very high signal-to-noise spectra of a sample of planetary nebulae. Analysis of lines from ions of Kr and Xe reveals enhancements in most of the PNe, in agreement with the theories of s-process in AGB star. Surprisingly, we did not detect lines from Br even though s-process calculations indicate that it should be produced with Kr at detectable levels.
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