An H II region in NGC 6744 - Spectrophotometry and chemical abundances

Astronomy and Astrophysics – Astrophysics

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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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