A simple interpretation of the isotopic anomalies in the Murchison meteorite is proposed whereby the Kr and Xe anomalies are effectively correlated and are ascribable to a pure s-component. They are produced in the He-burning thermal pulses by the operation of the (C-13)(alpha, n)(O-16) reaction and mixed in the envelope together with newly synthesized carbon. Then they are injected into the interstellar medium by solar winds, after having been condensed into grains in the extended envelopes of these giant stars, and are preserved in the interstellar medium as 'cosmic chemical memories'. The spread of Kr-80/Kr-82 ratios can then be understood if the interstellar medium from which the solar system condensed had been previously contaminated by different carbon stars with different metallicities, slightly lower than solar.
What do the KR isotopic anomalies in the Murchison meteorite tell us on carbon stars?
BUSSO, Maurizio Maria;
1990
Abstract
A simple interpretation of the isotopic anomalies in the Murchison meteorite is proposed whereby the Kr and Xe anomalies are effectively correlated and are ascribable to a pure s-component. They are produced in the He-burning thermal pulses by the operation of the (C-13)(alpha, n)(O-16) reaction and mixed in the envelope together with newly synthesized carbon. Then they are injected into the interstellar medium by solar winds, after having been condensed into grains in the extended envelopes of these giant stars, and are preserved in the interstellar medium as 'cosmic chemical memories'. The spread of Kr-80/Kr-82 ratios can then be understood if the interstellar medium from which the solar system condensed had been previously contaminated by different carbon stars with different metallicities, slightly lower than solar.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
