Paper:	Calibration of Photometric Absolute Magnitudes for Subdwarfs with Hipparcos
Volume:	167, Harmonizing Cosmic Distance Scales in a Post-Hipparcos Era
Page:	284
Authors:	Meillon, L.; Crifo, F.; Cayrel, R.; Perrin, M.-N.; Gómez, A. E.
Abstract:	In order to obtain better photometric distances for high-velocity stars in the Carney et al. (1994) sample, we have undertaken a calibration of photometric absolute magnitudes. From the intersection between this sample and the Hipparcos catalogue (770 common stars), we keep only single stars with the most reliable parallaxes (σπ/π)HIP <= 0.15). Metallicities, colours and absolute magnitudes of these stars are used with VandenBerg et al. (1998) isochrones in a colour-magnitude diagram. This set of isochrones allows us to derive photometric absolute magnitudes for the highest velocity stars. This photometric parallax calibration is discussed.

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