منابع مشابه
Stellar Evolution and Nucleosynthesis of Post-agb Stars
I discuss recent new models of post-Asymptotic Giant Branch stellar evolution. These models aim to clarify the evolutionary origin and status of a variety of hydrogen-deficient post-AGB stars such as central stars of planetary nebulae of Wolf-Rayet spectral type, PG1159 stars or Sakurai’s object. Starting with AGB models with overshoot such stars can evolve through one of four distinct channels...
متن کاملInsight into Agb and Post-agb Stellar Evolution with Fuse
FUSE spectroscopy has proved that extremely hot hydrogen-deficient post-AGB stars (PG1159 stars) display matter on their surface that usually remains hidden in the region between the Hand He-burning shells of the former AGB star. Hence, the spectral analysis of PG1159 stars allows to study directly the chemistry of this intershell region which is the outcome of complicated burning and mixing pr...
متن کاملStructure and Evolution of AGB Stars
An overview of the structure and evolution of Asymptotic Giant Branch stars is presented. We focus upon the occurrence of thermal pulses, hot bottom burning and mass loss and summarize briefly the corresponding nucleosynthesis and mixing events. The interplay between these important evolutionary features is discussed.
متن کاملStellar Evolution from AGB to Planetary Nebulae
Planetary nebulae are formed by an interacting winds process where the remnant of the AGB wind is compressed and accelerated by a later-developed fast wind from the central star. One-dimensional dynamical models have successfully explained the multi-shell (bubble, shell, crown, haloes) structures and the kinematics of planetary nebulae. However, the origin of the diverse asymmetric morphology o...
متن کاملs-Process Nucleosynthesis in AGB Stars: a Test for Stellar Evolution
We study the slow neutron capture process (s process) in Asymptotic Giant Branch (AGB) stars using three different stellar evolutionary models computed for a 3 M⊙ and solar metallicity star. First we investigate the formation and the efficiency of the main neutron source: the C(α,n)O reaction that occurs in radiative conditions. A tiny region rich in C (the C pocket) is created by proton captur...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1989
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/240.1.63