Photoionization Models of NGC 346

Details Photoionization Models of NGC 346 Photoionization Models of NGC 346

2001-09-07

arxiv.org/abs/astro-ph/0109113v1

Astronomy and Astrophysics

Astrophysics

23 pages, 2 figures, Accepted for publication in ApJ

Scientific paper

10.1086/324286

We present spherically symmetric and plane parallel photoionization models of NGC 346, an HII region in the Small Magellanic Cloud. The models are based on CLOUDY and on the observations of Peimbert, Peimbert, & Ruiz (2000). We find that approximately 45% of the H ionization photons escape from the HII region providing an important ionizing source for the low density interstellar medium of the SMC. The predicted I(4363)/I(5007) value is smaller than that observed, probably implying that there is an additional source of energy not taken into account by the models. From the ionization structure of the best model and the observed line intensities we determine the abundances of N, Ne, S, Ar, and Fe relative to O.

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