Distance Determination with Cepheid Variables
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Cepheid variables have long formed the backbone of the extra-galactic distance scale. The HST has greatly increased the range of Cepheid studies, making many more galaxies available for calibrating secondary distance indicators. This makes the calibration of the Cepheid period-luminosity relations, and investigations of systematic uncertainties, of crucial importance. We show that four routes to calibrating the V and I band PL relations (the most relevant for HST studies) give consistent results within their uncertainties. The metallicity sensitivity of Cepheid properties remains an important concern, but recent studies are beginning to provide useful quantitative constraints.
KeywordsDistance Modulus Large MAGELLANIC Cloud Distance Indicator Distance Determination Instability Strip
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