Abstract
We describe how the extragalactic distance indicator L depends on stellar population age, metallicity, and IMF, assuming single-burst ages between 5 and 17 Gyr and metallicities between −0.5 and +0.5 dex. We consider Johnson/Cousins BVR C l C JHKLL'M passbands. We find that (1) L is insensitive to changes in IMF, (2) L can be reliably calibrated against colors or spectral indices, due to the similarity of the effects of age and metallicity on the stellar populations, (3) the calibration presented here may already give distances good to 10% for an isolated galaxy measured in one fluctuation passband and one color or spectral index, not including observational error, and (4) our theoretical results are consistent with the distance of M32 and with the latest empirical Ī calibration and require no empirical corrections
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