Oxygen and Helium Abundances in Galactic H II Regions: Abundance Gradients

Details Oxygen and Helium Abundances in Galactic H II Regions: Abundance Gradients Oxygen and Helium Abundances in Galactic H II Regions: Abundance Gradients

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000rmxac...9..184p&link_type=abstract

"Astrophysical Plasmas: Codes, Models, and Observations, Proceedings of the conference held in Mexico City, October 25-29, 1999,

Astronomy and Astrophysics

Astrophysics

Scientific paper

Absolute integrated fluxes have been obtained for 34 H II regions, with Galactocentric distances RG in the 6.6-17.7 kpc range, in the emission lines O II λ3726 and λ3729, O III λ4363 and λ5007, HeI\ λ5876, Hα and Hβ. These fluxes are analyzed to derive the physical parameters, the ionic abundances O+/H+, O++/H+ and He+/H+ and the O/H abundances. Accurate electron temperatures have been derived in six H II regions with RG between 6.6 kpc and 14.8 kpc, widening the RG range for which reliable Te measurements exist. Our O/H relationship for 5 kpc=180) measured in the Galaxy.

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