Observations of forbidden S III in NGC 604 and N/S abundance gradients

Details Observations of forbidden S III in NGC 604 and N/S abundance gradients Observations of forbidden S III in NGC 604 and N/S abundance gradients

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..420h&link_type=abstract

Astrophysical Journal, Part 1, vol. 217, Oct. 15, 1977, p. 420-424.

Astronomy and Astrophysics

Astronomy

32

Abundance, Nebulae, Sulfur, Astronomical Models, Astronomical Spectroscopy, H Ii Regions, Infrared Astronomy, Nitrogen, Oxygen

Scientific paper

Line intensities have been obtained for NGC 604 - a giant H II region in M33 - in the wavelength range from 6312 to 10,049 A. Observations of the forbidden S III lines at 9069 and 9532 A yield an S(2+) abundance and an accurate total S abundance in agreement with that for the Orion Nebula. Previous investigators have seriously overestimated N/S. The use of the ratio between forbidden N II and forbidden S II emission lines as an abundance indicator is discussed, and it is concluded that, while a gradient in that ratio implies a gradient in N/S, a dependable calibration of line ratio versus abundance is unavailable.

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