Luminosity-dependent line ratios in disks of spiral galaxies

Details Luminosity-dependent line ratios in disks of spiral galaxies Luminosity-dependent line ratios in disks of spiral galaxies

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281l..21r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 281, June 1, 1984, p. L21-L24.

Astronomy and Astrophysics

Astrophysics

31

Abundance, Cosmochemistry, Luminosity, Spiral Galaxies, Correlation, Elliptical Galaxies, Nitrogen, Sulfur

Scientific paper

The emission-line intensity ratio of N II forbidden line double-lambda 6548 + 6583 relative to S II forbidden line double-lambda 6717 + 6731 averaged over a spiral disk (excluding the nucleus) increases with increasing galaxy luminosity, M(B) in the range from -14 to -23. S II forbidden line is strong in disks of low-luminosity spirals; N II forbidden line is strong in disks of high-luminosity spirals. Because the N(+)/S(+) ratio is a good approximation to the N to S abundance ratio, it is inferred that the enhancement of N due to secondary nucleosynthetic processing in successive generations of stars is greater in disks of high-mass spirals than in disks of low-mass spirals.

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