Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..594t&link_type=abstract
Astrophysical Journal, Part 1, vol. 252, Jan. 15, 1982, p. 594-600. Research supported by the University of Chicago
Astronomy and Astrophysics
Astrophysics
7
Abundance, Galactic Structure, H Ii Regions, Nebulae, Spectrophotometry, Galactic Radiation, Hydrogen Ions, Nuclear Fusion, Oxygen Ions
Scientific paper
Spectrophotometry of emission lines in the spectral range 3700-6800 A is presented for an H II region in an outer arm of NGC 6744, a Southern Hemisphere galaxy of type SAB(r)bc II. The electron temperature, derived from the forbidden O III lines and assuming Ne = 100/cu cm, is found to be 9,630 + or - 450 K. Ionic abundances, derived in the usual fashion from the measured line strengths, are corrected to total relative number abundances by application of the standard ionization correction factor scheme and by comparison with models. The NGC 6744 H II region abundances, as well as various ratios, are compared with similar data for H II regions in the SMC, LMC, and the Perseus arm of the Galaxy. The comparison suggests that the histories of nucleosynthesis in the outer regions of NGC 6744 and the Galaxy could have been quite similar.
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