What is the Real Origin of Presolar-Nova Grains?
Abstract
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.
- Publication:
-
Origin of Matter and Evolution of Galaxies
- Pub Date:
- December 2005
- DOI:
- 10.1142/9789812702739_0064
- Bibcode:
- 2005omeg.conf..541T