Paper:	Calibration of the Cepheid period-luminosity relation
Volume:	4, The Extragalactic Distance Scale: Proceedings of the ASP 100th Anniversary Symposium
Page:	89
Authors:	Walker, Alistair R.
Abstract:	For 75 years the absolute calibration of the Cepheid period-luminosity (PL) relation has been of vital importance, since Cepheids are the primary distance indicator for nearby galaxies, whose distances are in turn crucially important for fixing the distance scale out to cosmologically interesting distances. The PL relation, with its slope fixed from Cepheids in the Magellanic Clouds and its zero point fixed primarily from Cepheids in Galactic clusters, now appears to be able to predict the absolute magnitudes of Cepheids to an accuracy of about 0.1 mag. A significant part of the remaining error is due to the uncertainty of the distance to the Pleiades.

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