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Abundances of s-process elements in planetary nebulae: Br, Kr & Xe

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arxiv astro-ph/0605181 v1 pith:BME5XR57 submitted 2006-05-06 astro-ph

Y. Zhang , R. Williams , E. Pellegrini , K. Cavagnolo , J. A. Baldwin , B. Sharpee , M. Phillips , X.-W. Liu This is my paper
classification astro-ph
keywords liness-processelementsnebulaeplanetaryabundancesagreementanalysis
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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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