منابع مشابه
Galactic Chemical Evolution
The primary present-day observables upon which theories of galaxy evolution are based are a system's morphology, dynamics, colour, and chemistry. Individually, each provides an important constraint to any given model; in concert, the four represent a fundamental (intractable) boundary condition for chemody-namical simulations. We review the current state-of-the-art semi-analytical and chemodyna...
متن کاملBig-Bang Nucleosynthesis and Galactic Chemical Evolution
Deuterium is the best indicator of the baryon density; however, only its present abundance is known (and only locally) and its chemical evolution is intertwined with that of He. Because galactic abundances are spatially heterogeneous, mean chemical-evolution models are not well suited for extrapolating the pre-solar D and He abundances to their primeval values. We introduce a new approach which...
متن کاملAbundance Ratios and Galactic Chemical Evolution
The metallicity of stars in the Galaxy ranges from [Fe/H]=−4 to +0.5 dex, and the solar iron abundance is (Fe)= 7.51± 0.01 dex. The average values of [Fe/H] in the solar neighborhood, the halo, and Galactic bulge are−0.2,−1.6, and−0.2
متن کاملGalactic and Cosmic Chemical Evolution with Hypernovae
We provide new nucleosynthesis yields depending on metallicity and energy (i.e., (normal supernovae and hypernovae), and show the evolution of heavy element abundances from C to Zn in the solar neighborhood. We then show the chemodynamical simulation of the Milky Way Galaxy and discuss the G-dwarf problem. We finally show the cosmological simulation and discuss the galaxy formation and chemical...
متن کاملHypernova Nucleosynthesis and Galactic Chemical Evolution
We study nucleosynthesis in ’hypernovae’, i.e., supernovae with very large explosion energies ( ∼ > 10 ergs) for both spherical and aspherical explosions. The hypernova yields compared to those of ordinary corecollapse supernovae show the following characteristics: 1) Complete Siburning takes place in more extended region, so that the mass ratio between the complete and incomplete Si burning re...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2003
ISSN: 0074-1809
DOI: 10.1017/s0074180900209686