The effects of cluster environment on the chemical evolution of galaxies. I - NGC 4303

Details The effects of cluster environment on the chemical evolution of galaxies. I - NGC 4303 The effects of cluster environment on the chemical evolution of galaxies. I - NGC 4303

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..321h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 2, Sept. 15, 1992, p. 321-333. Research suppor

Other

36

Chemical Evolution, Galactic Clusters, Galactic Evolution, H Ii Regions, Spiral Galaxies, Interstellar Matter, Line Spectra, Metallicity, Photoionization

Scientific paper

New spectrophotometric observations extending from 3610-9400 A of 12 giant H II regions located in the disk of NGC 4303 are presented. By assuming a set of abundance gradients as input, a sequence of photoionization models which simultaneously predicts all three ratios over the observed portion of the galaxy disk is computed, making it possible to infer accurate abundance information for nitrogen, oxygen, and sulphur. All three of these elements exhibit negative gradients with slope values which are close to those measured in many other spirals. In addition, N/O increases, and S/O decreases with an increase of O/H, respectively. The observed oxygen and sulphur gradients are explained well by a closed-box model of chemical evolution, while the gradient for nitrogen is steeper than simple model predictions. A comparison of presently derived R23 and O/H gradients with published values for two other Virgo spirals and five well-observed field objects indicates that the cluster and field spirals are indistinguishable in terms of their abundance properties.

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