Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296l...1w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 296, Sept. 1, 1985, p. L1-L5.
Astronomy and Astrophysics
Astrophysics
46
Abundance, Disk Galaxies, Metallicity, Stellar Mass Ejection, Supernovae, H Ii Regions, Interstellar Gas, Nitrogen, Sulfur
Scientific paper
It is shown that observations of the relative abundances of nitrogen and sulfur in H II regions of disk galaxies favor the possibility of producing primary nitrogen in intermediate-mass stars. The constancy of the ratio of nitrogen to sulfur for low-luminosity disk galaxies and the rise with luminosity for more luminous galaxies may be interpreted as a consequence of supernova-driven winds efficiently removing stellar ejecta from galaxies with binding energy per unit mass below a critical value, shown here to be around 100 km/s, while more massive galaxies can enrich their gas through successive generations of stars. The effect of large gas loss from shallow potential wells is also manifest in the relation between mean gas metallicity, measured by the mean oxygen abundance in H II regions, and absolute magnitude of the parent galaxy.
Silk Joseph
~Wyse Rosemary F. G.
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