Fe5270, Fe5335, Mgb and Mg2 synthetic indices (Barbuy+,

Details Fe5270, Fe5335, Mgb and Mg2 synthetic indices (Barbuy+, Fe5270, Fe5335, Mgb and Mg2 synthetic indices (Barbuy+,

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ycat..34040661b&link_type=abstract

VizieR On-line Data Catalog: J/A+A/404/661. Originally published in: 2003A&A...404..661B

Computer Science

Models: Atmosphere, Abundances: Peculiar

Scientific paper

We have computed a grid of synthetic spectra in the wavelength range λλ4600-5600Å 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 Mg2 are measured on the grid spectra, for FWHM=2 to 8.3Å. Relations between the indices Fe5270, Fe5335 and Mg2 and stellar parameters effective temperature Teff, logg, [Fe/H] and [alpha/Fe], valid in the range 4000K>=Teff>=7000K, are presented. These fitting functions are given for FWHM=3.5 and 8.3Å. 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.
(11 data files).

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