AAS 206th Meeting, 29 May - 2 June 2005
Session 38 Interstellar Medium, H II Regions and Molecular Clouds
Poster, Wednesday, 10:00am-7:00pm, Thursday, 9:20am-2:00pm, June 1, 2005, Ballroom A

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[38.04] Chemical Composition of Two H II Regions in NGC 6822 Based on VLT Spectroscopy

M. Peimbert, A. Peimbert (Instituto de Astronomia, UNAM, Mexico), M. T. Ruiz (Departamento de Astronomia, Universidad de Chile)

We present long slit spectrophotometry of regions V and X of the local group irregular galaxy NGC 6822. The data consist of VLT FORS observations in the 3450 to 7400 Årange. We have obtained electron temperatures and densities using different line intensity ratios. We have derived the H, He, C, and O abundances based on recombination lines; the abundance ratios among these elements are almost independent of the temperature structure of the nebulae. We have also determined the N, O, Ne, S, Cl, and Ar abundances based on collisionally excited lines; the ratios of these abundances relative to that of H depend strongly on the temperature structure of the nebulae. We compare the chemical composition of NGC 6822 V with those of the Sun, the Orion nebula, NGC 346 in the SMC, and 30 Doradus in the LMC. The O/H value derived from recombination lines for NGC 6822 V is in good agreement with the value derived by Venn et al. (2001) from A type supergiants in NGC 6822.

MP received partial support from DGAPA UNAM (grant IN 114601). AP received partial support from DGAPA UNAM (grant IN 118405). MTR received partial support from FONDAP(15010003), a Guggenheim Fellowship and Fondecyt(1010404).

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Bulletin of the American Astronomical Society, 37 #2
© 2005. The American Astronomical Soceity.