Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..613h&link_type=abstract
Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 613-619.
Astronomy and Astrophysics
Astrophysics
5
Calcium Isotopes, Cosmochemistry, Meteoritic Composition, Nuclear Fusion, Titanium Isotopes, Abundance, Anomalies, Chromium, Solar System, Meteorites, Allende Meteorite, Isotopes, Anomalies, Calcium, Protons, Nuclei, Temperature, Inclusions, Fun, Cais, Manganese, Diagrams, Ek-1-4-1, Isotopic Ratios, Iron, Scandium, Synthesis, Experiments, Parameters, Data
Scientific paper
The goal of the study described here is to show that partial nuclear destruction of the Ca isotopes can reproduce the EK-1-4-1 pattern and can simultaneously produce the Ti anomaly observed in that inclusion. The parameterized approach adopted here yields little information about a likely stellar site. Considerations of time scale and proton density, however, both point to a hydrostatic O burning zone, with which the required s-process-like initial composition is compatible. The temperatures involved, however, are considerably lower than those estimated by Arnett (1977) and Weaver, Zimmerman, and Woosley (1978). It is found that slow proton captures on nuclei with Z between 18 and 25 at temperatures in the range where T9 ranges from 1.25 to 1.7 can reproduce the Ca isotopic anomaly in Allende Ca-Al-rich FUN inclusion EK-1-4-1. It is noted that at T9 = 1.55, the required proton exposure approximately reproduces the Ek-1-4-1 Ti anomaly also. Under these conditions, the production of long-lived Ca-41 and Mn-53, as well as of an anomaly in Cr, is predicted.
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