The O/H Distribution in the Transition Magellanic Galaxy NGC 1313

Details The O/H Distribution in the Transition Magellanic Galaxy NGC 1313 The O/H Distribution in the Transition Magellanic Galaxy NGC 1313

1997-05-06

arxiv.org/abs/astro-ph/9705031v1

Mon.Not.Roy.Astron.Soc. 288 (1997) 726

Astronomy and Astrophysics

Astrophysics

To appear in MNRAS. (Latex, 9 pages, 5 postscript figures)

Scientific paper

Multi-fibre emission-line spectrophotometry of 33 H II regions and 3 diffuse interstellar medium positions are presented for the barred Magellanic galaxy NGC 1313. The H II regions show a fairly narrow range of thermal conditions characteristic of high excitation nebular gas. Electron temperature was directly determined in four of the H II regions. The global O/H abundance distribution appears very flat across the disk at 12 + log O/H = 8.4 +/- 0.1, with possibly the bar regions having abundances higher by 0.2 dex than the outer disc. NGC 1313 is the highest mass barred galaxy known not to have any radial abundance gradient. The key role of the bar on the abundance distribution in disc galaxies is revisited.

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