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We continue the exploration of the BaLROG (Bars in Low Redshift OpticalGalaxies) sample: 16 large mosaics of barred galaxies observed with theintegral field unit SAURON. We quantify the influence of bars on thecomposition of the stellar component. We derive linestrength indices ofH${\beta}$, Fe5015 and Mgb. Based on single stellar population (SSP) models, wecalculate ages, metallicities and [Mg/Fe] abundances and their gradients alongthe bar major and minor axes. The high spatial resolution of our data allows usto identify breaks among index and SSP profiles, commonly at 0.13$\pm$0.06 barlength, consistent with kinematic features. Inner gradients are about ten timessteeper than outer gradients and become larger when there is a central rotatingcomponent, implying that the gradients are not independent of dynamics andorbits. Central ages appear to be younger for stronger bars. Yet, the barregions are usually old. We find a flattening of the iron (Fe5015) andmagnesium (Mgb) outer gradients along the bar major axis, translating into aflattening of the metallicity gradient. This gradient is found to be0.03$\pm$0.07 dex/kpc along the bar major axis while the mean value of the barminor axis compares well with that of an unbarred control sample and issignificantly steeper, namely -0.20$\pm$0.04 dex/kpc. These results confirmrecent simulations and discern the important localized influence of bars. Theelevated [Mg/Fe] abundances of bars and bulges compared to the lower values ofdiscs suggest an early formation, in particular for early type galaxies.

The BaLROG project - II. Quantifying the influence of bars on the stellar populations of nearby galaxies