The Buser-Kurucz library is a hybrid library in the sense that it is based on two distinct grids of model atmospheres which were calculated using different codes (ATLAS AND MARCS, respectively); it is quasi-homogeneous, however, because for both grids of model atmospheres the spectrum calculations were obtained using the same opacity source tables.

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The F- models were preferred to the B- models in establishing the semi-empirical 44#44 relation since they include a more accurate calculation of the opacity (the Opacity Sampling technique was used instead of the simple Straight Mean method which causes problems when lines saturate). These models also incorporate atomic data, as well as new opacities for the molecules (e.g. 45#45, TiO, VO), hence providing a significant improvement in the V-K synthetic colors at solar metallicity (Plez et al. 1992).

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...wavelengths

The mean wavelength 71#71 of a filter of transmission function S_i is defined in the following way:
72#72

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...:

Note that in some equations that follow we use a more compact notation to designate fundamental stellar parameters which is related to the usual notation by the equivalence 76#76.

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