Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26as...57..443o&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 57, Sept. 1984, p. 443-466. Research supported by the Staten
Astronomy and Astrophysics
Astrophysics
223
Calibrating, Dwarf Stars, G Stars, K Stars, Late Stars, M Stars, Stellar Color, Stellar Spectrophotometry, Abundance, Astronomical Catalogs, Helium, Ubv Spectra
Scientific paper
Four-color uvby photometry for several hundred late-type dwarf stars of types G, K and M is discussed. Mean values of photometric indices are given for MK spectral types between F8/G0V and M2V. Preliminary standard relations between the four-color indices are derived. Based on parallaxes and results from high-dispersion spectroscopic analyses, calibrations of the observed indices in terms of Mv, log Te and Fe/H have been derived. The means errors are 0.29 mag, 0.009 dex, and 0.17 dex, respectively. The calibrations are valid for class-V stars of all populations between G0 and M2. If extreme population-II dwarfs are excluded, the mean error of the abundance calibration decreases to 0.13 dex. Calibrations in terms of log g have been attempted,, but the low accuracy of the spectroscopic g determinations does not inspire confidence in the results. The possible contribution of a 'fourth-parameter' variation to the mean errors of the calibrations is briefly discussed. This fourth parameter could be the intrinsic helium abundance of the stars.
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