Metallicity estimates for H II regions in M81

Details Metallicity estimates for H II regions in M81 Metallicity estimates for H II regions in M81

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1702s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 89, Nov. 1984, p. 1702-1704.

Astronomy and Astrophysics

Astronomy

29

H Ii Regions, Metallicity, Nebulae, Spiral Galaxies, Abundance, H Lines, Oxygen Spectra

Scientific paper

Low-dispersion spectra for ten H II regions in the Sab galaxy M81 have been obtained. Oxygen abundances for those H II regions were estimated from the observed flux ratio of ([O II]+[O III])/Hβ. All the H II regions have fairly similar spectra, with a mean abundance near solar and a weak abundance gradient d[log(O/H)]/dr = -0.045 dex kpc-1. The derived abundances and abundance gradients are nearly identical to those observed in the Milky Way, considered by most to be of Hubble type Sb or later.

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