Physics – Atomic Physics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542502h&link_type=abstract
American Astronomical Society, AAS Meeting #215, #425.02; Bulletin of the American Astronomical Society, Vol. 42, p.336
Physics
Atomic Physics
Scientific paper
We present here the initial results of a new study of massive star yields of Fe-peak elements. We have compiled from the literature a database of carefully determined stellar abundances of seven iron-peak elements, Ti, V, Cr, Mn, Fe, Co, and Ni, and then plotted [X/Fe] versus [Fe/H] to study the trends as functions of metallicity. Chemical evolution models were then employed to fit the observed trends by adjusting input massive star metallicity-sensitive yields. The outcome of this exercise is the computation of a set of integrated yields, i.e., stellar yields weighted by the Salpeter initial mass function and integrated over stellar mass, for each of the above elements at several metallicity points spanned by the broad range of observations. These results are designed to be used as empirical constraints on future iron-peak yield predictions by stellar evolution modelers. Special attention is paid to the interesting behavior of [Cr/Co] with metallicity -- these two elements have opposite slopes -- as well as the indirect correlation of [Ti/Fe] with [Fe/H]. These particular trends, as well as those exhibited by the inferred integrated yields of all iron-peak elements with metallicity, are discussed in terms of both supernova nucleosynthesis and atomic physics. This work has been supported by the National Science Foundation through grants AST 08-06577 to RBCH, AST 07-07447 to JJC.
Cowan John J.
Henry Richard B. C.
Sobeck Jennifer
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