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Date and Time of the Query: 2019-06-17 T23:44:10 PDT
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For refcode 1971ApJ...168..327S:
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Copyright by American Astronomical Society. Reproduced by permission
1971ApJ...168..327S Evidence for Composition Gradients across the Disks of Spiral galaxies L. Searle Carnegie Institution of Washington Received 1971 April 7 Abstract The integrated spectra of HII regions located in the inner spiral arms of Sc galaxies are systematically different from those of HII regions in the outer arms. This is, in part at least, an abundance effect. The N/O ratio (and probably the abundance ratios of O/H and N/H) decreases from the inner to the outer arms.
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