منابع مشابه
Chemical Abundances in Virgo Spiral Galaxies
Received ; accepted 1 Based on observations obtained at the Multiple Mirror Telescope, a joint facility of the University of Arizona and the Smithsonian Institution. ABSTRACT We present new measurements of chemical abundances in H II regions in spiral galaxies of the Virgo cluster and a comparison of Virgo galaxies and eld spirals. With these new data there now exist nine Virgo spirals with abu...
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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 کاملDistances from Stellar Kinematics for Peculiar Virgo Cluster Spiral Galaxies
We present distance estimates for eleven peculiar Virgo cluster spiral galaxies based on measurements of the stellar kinematics of their central 2 kpc. Stellar circular velocities were obtained using two-integral dynamical models. Distances were obtained by comparing, at each radius, the stellar circular velocities with synthetic Hα rotation curves derived from NIR Tully-Fisher relations. The r...
متن کاملAbundances in Spiral Galaxies: Evidence for Primary Nitrogen Production
We present the results of nitrogen and oxygen abundance measurements for 185 H II regions spanning a range of radius in 13 spiral galaxies. As expected, the nitrogen–to–oxygen ratio increases linearly with the oxygen abundance for high metallicity H II regions, indicating that nitrogen is predominately a secondary element. However, the nitrogen–to–oxygen ratio plateaus for oxygen abundances les...
متن کاملKey Words: GALAXIES: ABUNDANCES – GALAXIES: EVOLUTION – GALAXIESL SPIRAL – GALAXIES: STELLAR CONTENT
We study the old problem of the uniqueness of chemical evolution models. We showed in Mollá et al. (1999) that multiphase models for three Virgo cluster galaxies were able to reproduce the observed radial distributions of spectral indices Mg2 and Fe52. But those models may fit the present-epoch radial distributions with different star formation histories (Tosi 1996). The two spectral indices ab...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 1991
ISSN: 0004-6280,1538-3873
DOI: 10.1086/132907