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We present measurements of the V and I band magnitudes of red clump stars in15 nearby galaxies obtained from recently published homogenous HST photometry.Supplementing these results with similar data for another 8 galaxies availablein the literature the populational effects on the V and I band magnitudes ofred clump stars were investigated. Comparing red clump magnitudes with theI-band magnitude of the TRGB in a total sample of 23 galaxies possessing verydifferent environments we demonstrate that population effects strongly affectboth the V and I band magnitude of red clump stars in a complex way. Ourempirical results basically confirm the theoretical results of Girardi andSalaris, and show that optical (VI) photometry of red clump stars is not anaccurate method for the determination of distances to nearby galaxies at thepresent moment, as long as the population effects are not better calibrated,both empirically and theoretically. Near infrared photometry is a much betterway to measure galaxy distances with red clump stars given its smallersensitivity to population effects.

The Araucaria Project. Population effects on the V and I band magnitudes of red clump stars