In this paper we present the evolution of various 15M(circle dot) stellar models of solar and subsolar chemical composition, calculated using different values for the C-12(alpha, gamma)O-16 reaction rate. This process influences the evolution of a star because it directly operates during the helium burning and it determines the final abundances of (12)G and O-16 left by this burning. Since this reaction works in a convective environment an analysis of its influence on the evolution of a star cannot be disentangled by the behavior of the convective core. Indeed the final C-12 and O-16 abundances largely depend on a delicate balance between the efficiency of this rate and the treatment of the convective core. We will show some tests which indicate quantitavely this interplay.
Influence of the 12C(α,γ)16O reaction rate on the evolution of a 15 M⊙ star / Imbriani, Gianluca; O., Straniero; F., Terrasi; M., Limongi; A., Chieffi. - In: NUCLEAR PHYSICS. A. - ISSN 0375-9474. - STAMPA. - 688:(2001), pp. 249-253. [10.1016/S0375-9474(01)00708-4]
Influence of the 12C(α,γ)16O reaction rate on the evolution of a 15 M⊙ star
IMBRIANI, GIANLUCA;
2001
Abstract
In this paper we present the evolution of various 15M(circle dot) stellar models of solar and subsolar chemical composition, calculated using different values for the C-12(alpha, gamma)O-16 reaction rate. This process influences the evolution of a star because it directly operates during the helium burning and it determines the final abundances of (12)G and O-16 left by this burning. Since this reaction works in a convective environment an analysis of its influence on the evolution of a star cannot be disentangled by the behavior of the convective core. Indeed the final C-12 and O-16 abundances largely depend on a delicate balance between the efficiency of this rate and the treatment of the convective core. We will show some tests which indicate quantitavely this interplay.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
