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29 March 2024
 
  » arxiv » astro-ph/0505002

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Near-UV Observations of CS29497-030: New Constraints on Neutron-Capture Nucleosynthesis Processes
Inese I. Ivans ; Christopher Sneden ; Roberto Gallino ; John J. Cowan ; George W. Preston ;
Date 30 Apr 2005
Journal Astrophys.J. 627 (2005) L145-L148
Subject astro-ph
AffiliationCaltech), Christopher Sneden (U Texas-Austin), Roberto Gallino (U Torino), John J. Cowan (U Oklahoma), and George W. Preston (OCIW-Pasadena
AbstractEmploying spectra obtained with the new Keck I HIRES near-UV sensitive detector, we have performed a comprehensive chemical composition analysis of the binary blue metal-poor star CS29497-030. Abundances for 29 elements and upper limits for an additional seven have been derived, concentrating on elements largely produced via neutron-capture nucleosynthesis. Included in our analysis are the two elements that define the termination point of the slow neutron-capture process, lead and bismuth. We determine an extremely high value of [Pb/Fe] = +3.65 +/- 0.07 (sigma = 0.13) from three features, supporting the single-feature result obtained in previous studies. We also detect Bi for the first time in a metal-poor star. Our derived Bi/Pb ratio is in accord with those predicted from the most recent FRANEC calculations of the slow neutron-capture process in low-mass AGB stars. We find that the neutron-capture elemental abundances of CS29497-030 are best explained by an AGB model that also includes very significant amounts of pre-enrichment of rapid neutron-capture process material in the protostellar cloud out of which the CS29497-030 binary system formed. Thus, CS29497-030 is both an ``r+s’’ and ``extrinsic AGB’’ star. Furthermore, we find that the mass of the AGB model can be further constrained by the abundance of the light odd-element [Na/Fe] which is sensitive to the neutron excess.
Source arXiv, astro-ph/0505002
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