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A grid of synthetic spectra and indices Fe5270, Fe5335, Mgb and Mg$_\mathsf{2}$ as a function of stellar parameters and [ $\mathsf{\alpha}$/Fe]

2003; EDP Sciences; Volume: 404; Issue: 2 Linguagem: Inglês

10.1051/0004-6361

1432-0746

B. Barbuy, M. N. Perrin, D. Katz, P. Coelho, R. Cayrel, M. Spite, C. van ’t Veer-Menneret,

Galaxies: Formation, Evolution, Phenomena

We have computed a grid of synthetic spectra in the wavelength range λλ 4600-5600 Å using revised model atmospheres, for a range of atmospheric parameters and values of [α-elements/Fe] = 0.0 and +0.4.The Lick indices Fe5270, Fe5335, Mgb and Mg 2 are measured on the grid spectra for FWHM = 2 to 8.3 Å. Relations between the indices Fe5270, Fe5335 and Mg 2 and the stellar parameters effective temperature T eff , log g, [Fe/H] and [α/Fe], valid in the range 4000 ≤ T eff ≤ 7000 K, are presented.These fitting functions are given for FWHM = 3.5 and 8.3 Å.The indices were also measured for a list of 97 reference stars with well-known stellar parameters observed at ESO and OHP, and these are compared to the computed indices.Finally, a comparison of the indices measured on the observed spectra and those derived from the fitting functions based on synthetic spectra is presented.