Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8133432 | Chinese Astronomy and Astrophysics | 2016 | 18 Pages |
Abstract
Previous studies have shown that, for the three main stages of the development and evolution of asymptotic giant branch (AGB) star s-process models, the neutron exposure distribution (DNE) in the nucleosynthesis region can always be considered as an exponential function, i.e., ÏAGB(Ï) = C/Ï0 exp(âÏ/Ï0) in an effective range of the neutron exposure values. However, the specific expressions of the proportion factor C and the mean neutron exposure Ï0 in the exponential distribution function for different models are not completely determined in the related literature. Through dissecting the basic method to obtain the exponential DNE, and systematically analyzing the solution procedures of neutron exposure distribution functions in different stellar models, the general formulae, as well as their auxiliary equations, for calculating C and Ï0 are derived. Given the discrete neutron exposure distribution Pk, the relationships of C and Ï0 with the model parameters can be determined. The result of this study has effectively solved the problem to analytically calculate the DNE in the current low-mass AGB star s-process nucleosynthesis model of 13C-pocket radiative burning.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Astronomy and Astrophysics
Authors
Zhang Feng-Hua, Zhou Gui-De, Ma Kun, Ma Wen-Juan, Cui Wen-Yuan, Zhang Bo,