A New Astrophysical Interpretation of the Si and Ti Isotopic Compositions of Mainstream SiC Grains from Primitive Meteorites

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dc.creatorLugaro, Maria
dc.creatorGallino, Roberto
dc.creatorBusso, Maurizio
dc.creatorAmari, Sachiko
dc.creatorZinner, Ernst
dc.date1998-09-16
dc.date.accessioned2026-07-07T02:27:57Z
dc.date.available2026-07-07T02:27:57Z
dc.descriptionMainstream presolar SiC grains from primitive meteorites show a clear s-process signature in the isotopic composition of heavy trace elements. These grains most likely condensed in the winds of a variety of AGB stars. However, the non-solar and correlated Si and Ti isotopic compositions measured in these grains are inconsistent with a pure s-signature. We present a possible solution to this much-discussed problem by assuming a spread in the original composition of parent AGB stars due to small chemical inhomogeneities in the interstellar medium at the time of their birth. These inhomogeneities may naturally arise from variations in the contributions of each nuclide to the interstellar medium by the relevant stellar nucleosynthetic sites, SNII and different subtypes of SNIa.
dc.description4 pages, 2 figures, submitted for the Proceedins of the Fifth International Symposium on Nuclei in the Cosmos (Volos, Greece, 5-12 July 1999, ed. N. Prantzos (Editions Frontieres, France), 1999
dc.identifierhttps://arxiv.org/abs/astro-ph/9809212
dc.identifierhttp://arxiv.org/abs/astro-ph/9809212
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/12918
dc.subjectAstrophysics
dc.titleA New Astrophysical Interpretation of the Si and Ti Isotopic Compositions of Mainstream SiC Grains from Primitive Meteorites
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