Abstract
view Abstract Citations (32) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of [S III] in NGC 604 and N/S abundance gradients. Hawley, S. A. ; Grandi, S. A. Abstract 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. Publication: The Astrophysical Journal Pub Date: October 1977 DOI: 10.1086/155590 Bibcode: 1977ApJ...217..420H Keywords: Abundance; Nebulae; Sulfur; Astronomical Models; Astronomical Spectroscopy; H Ii Regions; Infrared Astronomy; Nitrogen; Oxygen; Astrophysics full text sources ADS | data products NED (2)
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