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- W1503202108 abstract "We present the rst high resolution spectra of individual stars in the dwarf irregular galaxy, NGC 6822. The spectra of the two A-type supergiants were obtained at the VLT and Keck Observatories, using UVES and HIRES, respectively. The mean iron abundance from these two stars is h[Fe=H]i = 0:49 0:22. This conrms that NGC 6822 has a metallicity that is slightly higher than that of the SMC. The mean stellar oxygen abundance, 12 + log(O=H) = 8:36 0:19, which is in good agreement with the nebular oxygen results. Oxygen has the same underabundance as iron, h[O=Fe]i = +0:02 0:20. This O=Fe ratio is very similar to that seen in the Magellanic Clouds, which supports the picture that chemical evolution occurs more slowly in these lower mass galaxies. Combining all of the oxygen abundance information for NGC 6822 shows that there is no trend in oxygen with galactocentric distance. However, a subset of the highest quality data are consistent with a radial abundance gradient." @default.
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- W1503202108 date "2002-02-01" @default.
- W1503202108 modified "2023-10-16" @default.
- W1503202108 title "First stellar abundances in NGC6822" @default.
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