A grid of synthetic spectra and indices Fe5270, Fe5335, Mgb and Mg as a function of stellar parameters and [ /Fe] *,**
Universidade de São Paulo, Rua do Matão 1226, São Paulo 05508-900, Brazil e-mail: firstname.lastname@example.org
2 Observatoire de Paris, 61 av. de l'Observatoire, 75014 Paris, France e-mail: Marie-Noel.Perrin@obspm.fr,Roger.Cayrel@obspm.fr
3 Observatoire de Paris-Meudon, 92195 Meudon, France e-mail: David.Katz@obspm.fr,Monique.Spite@obspm.fr,Claude.Vantveer@obspm.fr
Corresponding author: B. Barbuy, email@example.com
Accepted: 20 March 2003
We have computed a grid of synthetic spectra in the wavelength range 4600–5600 Å using revised model atmospheres, for a range of atmospheric parameters and values of [ and +0.4. The Lick indices Fe5270, Fe5335, Mgb and Mg2 are measured on the grid spectra for to 8.3 Å. Relations between the indices Fe5270, Fe5335 and Mg2 and the stellar parameters effective temperature , [Fe/H] and [ α/Fe] , valid in the range K, are presented. These fitting functions are given for 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.
Key words: stars: abundances
Observations collected at the European Southern Observatory (ESO), La Silla, Chile and at the Observatoire de Haute Provence (OHP), St-Michel, France.
© ESO, 2003