Spitzer finds cosmic neon's and sulfur's sweet spot: part III, NGC 6822

Details Spitzer finds cosmic neon's and sulfur's sweet spot: part III, NGC 6822 Spitzer finds cosmic neon's and sulfur's sweet spot: part III, NGC 6822

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010iaus..265..249r&link_type=abstract

Chemical Abundances in the Universe: Connecting First Stars to Planets, Proceedings of the International Astronomical Union, IAU

Astronomy and Astrophysics

Astronomy

Ism: Abundances, H Ii Regions, Stars: Atmospheres, Galaxies: Individual (Ngc 6822)

Scientific paper

We observed several H ii regions in the dwarf irregular galaxy NGC 6822 using the infrared spectrograph on the Spitzer Space Telescope. Our aim is twofold: first, to examine the neon to sulfur abundance ratio in order to determine how much it may vary and whether or not, it is fairly ‘universal’ second, to discriminate and test the predicted ionizing spectral energy distribution between various stellar atmosphere models by comparing with our derivation of the ratio of fractional ionizations involving neon and sulfur. This work extends our previous similar studies of H ii regions in M83 and M33 to lower metallicities.

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