Physics – Optics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..722w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 722-732. Research supported by NSERC.
Physics
Optics
32
Abundance, Astronomical Spectroscopy, Galaxies, H Ii Regions, Spectrophotometry, Forbidden Transitions, Metallicity, Oxygen Spectra
Scientific paper
The fiber optics coupling aperture-plate system (FOCAP) of the Anglo-Australian Observatory was used to obtain low-dispersion spectra of 49 H II regions across the galaxy NGC 2997. Problems with employing fiber optics for spectrophotometry are discussed. Correlations between line ratios used as diagnostics for physical conditions and abundances in H II regions are identical to those found by McCall, Rybski, and Shields (1985) for a large number of giant H II regions in 26 galaxies. The O/H radial abundance gradient in NGC 2997 was derived using the calibration of the index (forbidden O II + forbidden O III)/H-beta. The gradient and the mean metallicity of NGC 2997 are comparable to those of M51. There is significant dispersion in (forbidden O II + forbidden O III)/H-beta and forbidden O III/H-beta at any given galactocentric distance. No N(+)/O(+) gradient is observed, and the mean value of this ratio is identical to that of Galactic H II regions.
ROY Jean-Rene
Walsh Jonathan R.
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