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Parametric study of heavy element isotopic abundances in SiC grains

par Arnould, Marcel ;Howard, William Michael
Référence Meteoritics, 28, 4, page (561-569)
Publication Publié, 1993

Article révisé par les pairs

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Résumé :

This paper presents a new interpretation of the non-solar isotopic composition of a series of elements from Si to Sm found in small-sized (μm) SiC grains of presumably circumstellar origin. It is found that the general trends of the isotopic data of Si, Ca, Ti, Sr, Kr, Xe, Ba, Nd and Sm can be reproduced with a much weaker neutron exposure than contemplated in previous studies. Such a neutron irradiation history does not necessitate the classical assumption of an admixture of an s-process component to normal solar abundances. Instead, the linear correlations observed in three-isotope plots are interpreted in terms of a mixture of components having experienced slightly different neutron exposures. In this framework, predictions are provided for all the elements from Si to Bi, and implications for possible astrophysical sites are discussed. -from Authors