منابع مشابه
Chemical Evolution of Cno Abundances
New low and intermediate mass star yields recalculated by Buell (1987) are evaluated by using them in a Galactic Chemical Evolution model. We analyze their effects on CNO elemental abundances
متن کاملCno Abundances in Dwarf and Spiral Galaxies
CNO abundances in galaxies bear on issues of galactic evolution as well as stellar evolution and nucleosynthesis. Knowledge about them in dwarf and spiral galaxies depends mainly on emission lines from H ii regions, with information from stars and supernova remnants available for galaxies in the Local Group. Oxygen abundances can be related to both local and global properties of the parent gala...
متن کاملCNO abundances in the Damped Lyα clouds
Damped Lyα clouds provide information on the chemistry of distant and metal poor regions of the universe. In these clouds for observational difficulties N and O are among the last elements to be measured, and C has still to be measured with precision. In combining the extant CNO abundances, we avail of a sample which includes 33 N measurements or significant limits, a dozen of O measurements, a...
متن کاملCNO abundances in the Galactic bulge
The carbon, nitrogen, and oxygen abundances and trends in the bulge are discussed in the context of our recent analysis of these elements in an on-going project based on near-IR spectra (Ryde et al. 2009). We obtained these using the CRIRES spectrometer on the VLT. The formation and evolution of the Milky Way bulge can be constrained by studying elemental abundances of bulge stars. Due to the l...
متن کاملNova nucleosynthesis and Galactic evolution of the CNO isotopes
In this paper we study the role played both by novae and single stars in enriching the interstellar medium of the Galaxy with CNO group nuclei, in the framework of a detailed successful model for the chemical evolution of both the Galactic halo and disc. First, we consider only the nucleosynthesis from single low-mass, intermediate-mass and massive stars. In particular, the nucleosynthesis pres...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1983
ISSN: 0252-9211
DOI: 10.1017/s0252921100090205