Spectrophotometric properties of galaxies at intermediate redshifts (
- F. Lamareille
- T. Contini
- J. Brinchmann
- J.-F. Le Borgne
- S. Charlot
- J. Richard
DOIAbstract
We present the gas-phase oxygen abundance (O/H) for a sample of 131 star-forming galaxies at intermediate redshifts ($0.2<z<1.0$). The sample selection, the spectroscopic observations (mainly with VLT/FORS) and associated data reduction, the photometric properties, the emission-line measurements, and the spectral classification are fully described in a companion paper (Paper I). We use two methods to estimate the O/H abundance ratio: the “standard” $R_{\mathrm{23}}$ method which is based on empirical calibrations, and the CL01 method which is based on grids of photo-ionization models and on the fitting of emission lines. For most galaxies, we have been able to solve the problem of the metallicity degeneracy between the high- and low-metalli...
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