Oxygen and helium abundances in Galactic Hii regions - II. Abundance gradients

Details Oxygen and helium abundances in Galactic Hii regions - II. Abundance gradients Oxygen and helium abundances in Galactic Hii regions - II. Abundance gradients

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.311..329d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 311, Issue 2, pp. 329-345.

Astronomy and Astrophysics

Astronomy

138

Ism: Abundances, Hii Regions, Galaxy: Abundances

Scientific paper

The absolute integrated fluxes that we obtained (Paper I) for 34 Hii regions, with Galactocentric distances RG in the 6.6-17.7kpc range, in the emission lines [Oii] λλ3726 and 3729, [Oiii] λλ4363 and 5007, Hei λ5876, Hα and Hβ, are analysed to derive the extinctions, the electron densities and temperatures, the ionic abundances O+/H+, O++/H+ and He+/H+ and the O/H abundances. The electron temperature has been derived from the [Oiii] λ4363/λ5007 ratio in six Hii regions with RG between 6.6 and 14.8kpc. These new measurements of Te, which are in good agreement with those from radio recombination lines, widen the RG range for which reliable Te measurements exist. Combining our new Te([Oiii]) results with the radio values, we obtain the following temperature relationship: Te K]=(372+/-38)RG+4260+/-350. The O+/H+ and O++/H+ abundances have been obtained assuming a two-temperature Hii region model. Our O/H relationship for 5kpc=180) measured in the Galaxy by Peimbert et al.

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