Oxygen and helium abundances in Galactic H ii regions – I. Observations |
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| Authors: | J Caplan L Deharveng M Peña R Costero C Blondel |
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| Institution: | Observatoire de Marseille, 2 place Le Verrier, 13248 Marseille Cedex 4, France; Instituto de Astronomía, UNAM, Apdo. Postal 70-264, Cd. Universitaria, 04510 México, D.F., México; Service d'Astrophysique, DAPNIA, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France |
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| Abstract: | Absolute integrated line fluxes of H ii regions have been measured using a Fabry–Perot spectrophotometer. We describe the observations and calibration procedures. Fluxes are given for 36 H ii regions with Galactocentric distances ranging from 6.6 to 17.7 kpc. Several emission lines have been measured, mainly O ii ] λλ 3726 and 3629, H β , O iii ] λ 5007, He i λ 5876 and H α . The very faint O iii ] λ 4363 line has been measured in six regions, allowing a direct determination of the electron temperature. New photometric distances have been derived based on data from the literature. A discussion of these results in terms of extinction, electron density and temperature, and oxygen and helium abundances is given in Paper II. |
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| Keywords: | instrumentation: miscellaneous techniques: photometric ISM: abundances H ii regions |
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