Other
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998natur.391..559s&link_type=abstract
Nature, vol. 391, p. 559
Other
57
Red Giant Stars, Solar System Evolution, Nuclides, Stellar Evolution, Supernovae, Molecular Clouds, Ion Distribution, Energetic Particles
Scientific paper
While short-lived, early solar system nuclides could have originated from a single stellar object, such as a nearby red-giant or a supernova, observations of enhanced ion fluxes in a molecular cloud have led to other models in which they are formed by energetic particle irradiation of gas and dust in the protosolar molecular cloud. Alternatively, irradiation by energetic particles from the active early sun may have occurred within the solar nebula itself. We show that there is a correlation between the initial abundances of Ca-41 and Al-26 in samples of primitive meteorite, implying a common origin for the short-lived nuclides. We can therefore rule out the mechanisms based on energetic particle irradiation, as they cannot produce simultaneously the inferred initial abundances of both nuclides. If, as our results suggest, a single stellar source is responsible for generating these nuclides, we can constrain to less than one million years the timescale for the collapse of the protosolar cloud to form the sun.
Davis Aileen M.
Goswami Jitendra N.
Grossman Lawrence
Lewis Reed S.
Sahijpal Sandeep
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