CHEMICAL ABUNDANCES AND PHYSICAL PARAMETERS OF HII REGIONS IN THE MAGELLANIC CLOUDS

摘要

We used ultraviolet, optical and infrared data of eleven HIT regions in the Magellanic Clouds in order to determine their physical parameters and chemical abundances. The photoionization modeling of six HIT regions in the LMC and five HIT regions in the SMC, allowed us to derive the abundances of He, C, N, O, Ne, S and Ar, which were compared with those obtained in the literature for HIT regions, PN, and stars. The abundances were obtained by adjusting models of the CLOUDY code to the observed line intensities. The observations obtained at the Observatorio Pico dos Dias of [S II] lambda 6717/lambda 6731 line ratios for HIT regions in the SMC allowed the determination of the electron density with a high precision. Furthermore, the IUE data on [C III] lambda 1909 lines were. used to determine the abundance of carbon of six and five HII regions in the LMC and SMC, respectively.