Galactic Evolution of D and 3He Including Stellar Production of 3He
نویسندگان
چکیده
منابع مشابه
GALACTIC EVOLUTION OF D AND 3 He INCLUDING STELLAR PRODUCTION OF 3 He
New stellar models which track the production and destruction of He (and D) have been evolved for a range of stellar masses (0:65 M=M 100), metallicities (0:01 Z=Z 1) and initial (main sequence) He mass fractions (10 5 X3;MS 10 ). Armed with the He yields from these stellar models we have followed the evolution of D and He using a variety of chemical evolution models with and without infall of ...
متن کاملProton polarizations in polarized 3He studied with the 3He(e,e'p)d and 3He(e,e'p)pn processes
We study within the Faddeev framework the 3He( e, e′p)d as well as the 3He( e, e′p)pn and 3He( e, e′n)pp reactions in order to extract information on the proton and neutron polarization in polarized 3He. We achieve clear analytical insight for simplified dynamical assumptions and define conditions for experimental access to important 3He properties. In addition we point to the possibility of me...
متن کاملThermodynamic properties of the ionized gas 3He
In this article, we have calculated some thermodynamic properties for a system consisting of singy ionized 3He atoms and their corresponding removed electrons by employing the second quantization method at finite temperature. To perform the calculations, we have considered the kinetic term, and Coulomb interaction between the particles in our Hamiltonian. The calculated properties are free ener...
متن کاملShapes of 3He clusters.
Triaxial deformations are considered for determining the binding energies of open-shell, unpolarized HeN clusters. The shapes of He clusters are found to be close to spherical, in contrast to the well-deformed shapes of alkali-metal clusters. As a result, odd-even alternations and subshell closures between major shells are absent in the size evolution of the chemical potentials, and the second-...
متن کاملMixing in Stars and the Evolution of the 3he Abundance
We first recall the observational and theoretical facts that constitute the so-called He problem. We then review the chemical anomalies that could be related to the destruction of He in red giants stars. We show how a simple consistent mechanism can lead to the destruction of He in low mass stars and simultaneously account for the low C/C ratios and low lithium abundances observed in giant star...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1996
ISSN: 0004-637X,1538-4357
DOI: 10.1086/177472