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We analyze a set of optical-to-near-infrared long-slit nuclear spectra of 16infrared-luminous spiral galaxies. All of the studied sources present H$_2$emission, which reflects the star-forming nature of our sample, and theyclearly display H I emission lines in the optical. Their continua contain manystrong stellar absorption lines, with the most common features due to Ca I, CaII, Fe I, Na I, Mg I, in addition to prominent absorption bands of TiO, VO,ZrO, CN and CO. We report a homogeneous set of equivalent width (EW)measurements for 45 indices, from optical to NIR species for the 16star-forming galaxies as well as for 19 early type galaxies where we collectedthe data from the literature. This selected set of emission andabsorption-feature measurements can be used to test predictions of theforthcoming generations of stellar population models. We find correlationsamong the different absorption features and propose here correlations betweenoptical and NIR indices, as well as among different NIR indices, and comparethem with model predictions. While for the optical absorption features themodels consistently agree with the observations,the NIR indices are much harderto interpret. For early-type spirals the measurements agree roughly with themodels, while for star-forming objects they fail to predict the strengths ofthese indices.

Optical/NIR stellar absorption and emission-line indices from luminous infrared galaxies