Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.2048g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, no. 6, June 1992, p. 2048-2062. Research supported by Jacobson Fund.
Astronomy and Astrophysics
Astronomy
12
Dwarf Stars, F Stars, G Stars, K Stars, Star Clusters, Ubv Spectra, Astronomical Catalogs, Color-Magnitude Diagram, Metallicity, Stellar Luminosity, Stellar Spectrophotometry
Scientific paper
Washington C, M, T1, T2, and Johnson V, B-V photometry of nearby F, G, and K dwarfs are presented. The present calibrations of (Fe/H) with the Washington colors have residuals approaching those of spectroscopic metallicities. The color-magnitude calibrations are based on nearby stars having precise parallaxes with metallicities ranging from 0.25 to -1.8 dex relative to the sun. It is concluded that the C-M and M - T2 colors are the best ones for determining metallicities in dwarfs using the Washington photometric system; the T1 filter would be redundant to the M filter. The study is a preliminary one and slight refinements from additional observations would allow these calibrations to replace the Hyades as the lowest rung in the distance ladder.
Gonzalez Guillermo
Piche' Francois
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