We present a new formula for absolute magnitude determination for late-type dwarf stars as a function of (g – r) and (r – i) for Sloan photometry. The absolute magnitudes estimated by this approach are brighter than those estimated by colour-magnitude diagrams, and they reduce the luminosity function rather close to the luminosity function of Hipparcos. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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