A grid of synthetic spectra and indices Fe5270, Fe5335, Mgb and Mg2 as a function of stellar parameters and [α/Fe]

被引:68
作者
Barbuy, B
Perrin, MN
Katz, D
Coelho, P
Cayrel, R
Spite, M
Van 't Veer-Menneret, C
机构
[1] Univ Sao Paulo, BR-05508900 Sao Paulo, Brazil
[2] Observ Paris, F-75014 Paris, France
[3] Observ Paris, F-92195 Meudon, France
关键词
stars; abundances;
D O I
10.1051/0004-6361:20030496
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have computed a grid of synthetic spectra in the wavelength range lambdalambda 4600 - 5600 Angstrom using revised model atmospheres, for a range of atmospheric parameters and values of [alpha- 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 Angstrom. Relations between the indices Fe5270, Fe5335 and Mg-2 and the stellar parameters effective temperature T-eff, log g, [ Fe / H] and [alpha / Fe], valid in the range 4000 less than or equal to T-eff less than or equal to 7000 K, are presented. These fitting functions are given for FWHM = 3.5 and 8.3 Angstrom. 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.
引用
收藏
页码:661 / 668
页数:8
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