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HD 216043


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Preliminary UVBY calibrations for G and K type dwarf stars
Four-color uvby photometry for several hundred late-type dwarf stars oftypes G, K and M is discussed. Mean values of photometric indices aregiven for MK spectral types between F8/G0V and M2V. Preliminary standardrelations between the four-color indices are derived. Based onparallaxes and results from high-dispersion spectroscopic analyses,calibrations of the observed indices in terms of Mv, log Te and Fe/Hhave been derived. The means errors are 0.29 mag, 0.009 dex, and 0.17dex, respectively. The calibrations are valid for class-V stars of allpopulations between G0 and M2. If extreme population-II dwarfs areexcluded, the mean error of the abundance calibration decreases to 0.13dex. Calibrations in terms of log g have been attempted,, but the lowaccuracy of the spectroscopic g determinations does not inspireconfidence in the results. The possible contribution of a'fourth-parameter' variation to the mean errors of the calibrations isbriefly discussed. This fourth parameter could be the intrinsic heliumabundance of the stars.

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Сазвежђа:Тукан
Ректацензија:22h50m54.52s
Deклинација:-62°48'52.9"
Apparent магнитуда:7.594
Даљина:83.333 parsecs
Proper motion RA:-18.8
Proper motion Dec:-1.9
B-T magnitude:8.493
V-T magnitude:7.669

Каталог и designations:
Proper имена
HD 1989HD 216043
TYCHO-2 2000TYC 9121-251-1
USNO-A2.0USNO-A2 0225-31647310
HIPHIP 112826

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