Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf...59a&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Presolar SiC grains of the types mainstream, Y, and Z are believed to have formed in thermally pulsing asymptotic giant branch stars with a range of metallicity: mainstream grains in stars of close-to-solar metallicity, Y grains in stars of around half-solar metallicty, and Z grains in stars of around one-third solar metallicity. From their Si and Ti isotopic ratios, it is possible to obtain information on both neutron capture processes that take place in the He intershell and initial compositions of the parent stars of the grains. Since Z grains formed in stars with the lowest metallicity, their study will likely provide insight into the Galactic chemical evolution of these elements as well as nuclear processes in low-metallicity stars. A preliminary comparison of data on Z grains with models of AGB stars confirms that Z grains formed in low-metallicity stars (Z≤0.006). The 12C/13C ratios of the Z grains indicate that in these stars cool bottom processing operates during the third dredge-up.
Amari Sachiko
Dominguez Inma
Gallino Roberto
Lugaro Maria
Straniero Oscar
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