A photometric comparison between the Hyades main sequence and a spectroscopically-chosen sample of field dwarfs

Graeme H. Smith1
1 University of California Observatories/Lick Observatory, University of California, Santa Cruz, CA 95064, USA

Abstract. A sample of field dwarfs with spectroscopic metallicities derived on a uni- form abundance scale by Valenti & Fischer is compared with Hyades main sequence stars in various photometric diagrams. Field dwarfs with metallicities 0.14 ≤ [Fe/H] ≤ 0.29 are found to match the Hyades (m1 , b − y) locus very well. In both the (MV , B− V) colour-magnitude diagram and the (c1 , b − y) diagram the Hyades main sequence is found to form a lower envelope to the field dwarfs of this metallicity range. There is no evidence in the comparisons made for the so-called Hyades anomaly.

Keywords: stars: abundances – stars: fundamental parameters (colours)

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