What is the Real Origin of Presolar-Nova Grains?

Details What is the Real Origin of Presolar-Nova Grains? What is the Real Origin of Presolar-Nova Grains?

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf..541t&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

Scientific paper

We investigate important reactions and reaction paths in order to reproduce the isotopic ratios of characteristic elements, C, N, and Si, in presolar SiC grains from novae. We find that the N-isotopic ratio strongly depends on the temperature profile in a nova explosion. By using this temperature dependence, we obtain a favorable temperature profile during a nova outburst. Moreover, the calculated 30Si/28Si ratio is high compared with the observational data of presolar nova grains. We also find that this overproduction of 30Si can be avoided if the reaction rate of 30P(p,γ)31S, which is experimentally still unknown, could increase by a factor of a few tens around the temperature of ~3 × 108 K.

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