On the composition of H II regions in southern galaxies. II - NGC 6822 and 1313

Details On the composition of H II regions in southern galaxies. II - NGC 6822 and 1313 On the composition of H II regions in southern galaxies. II - NGC 6822 and 1313

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.193..219p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 193, Oct. 1980, p. 219-230.

Astronomy and Astrophysics

Astronomy

195

Chemical Composition, Galactic Nuclei, H Beta Line, H Ii Regions, Abundance, Electron Energy, Emission Spectra, H Alpha Line, Oxygen

Scientific paper

AAT/IPCS spectra have been obtained from seven outlying H II regions in the Local Group Im galaxy NGC 6822 and from the nucleus and six H II regions at various radial distances in the isolated SBd galaxy NGC 1313. Abundances are deduced from emission-line intensities by a combination of direct electron-temperature determinations and estimates based on the excitation class inferred from log (O II + O III)/H-beta. Both galaxies have quite uniform abundances all over, in agreement with previous findings for the arm regions of a barred spiral and for Magellanic Irregulars. The abundance ratio N/O in NGC 6822 is exceptionally low, extending a result previously found by Lequeux et al.

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