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HD 66339


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A revised effective-temperature calibration for the DDO photometric system
A revised effective-temperature calibration for the David DunlapObservatory (DDO) photometric system is presented. Recently publishedphotometric and spectroscopic observations of field and open-cluster Gand K stars allow a better definition of the solar-abundance fiducialrelation in the DDO C0(45-48) vs. C0(42-45)diagram. The ability of the DDO system to predict MK spectral types of Gand K giants is demonstrated. The new DDO effective temperaturecalibration reproduces satisfactorily the infrared temperature scale ofBell and Gustafsson (1989). It is shown that Osborn's (1979) calibrationunderestimates the effective temperatures of K giants by approximately170 K and those of late-type dwarfs by approximately 150 K.

Untersuchungen an Farbenindizes II. Mit 1 Textabbildung
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Observation and Astrometry data

Constellation:Carina
Right ascension:08h00m12.52s
Declination:-55°12'57.0"
Apparent magnitude:7.107
Distance:190.84 parsecs
Proper motion RA:-18.4
Proper motion Dec:23.5
B-T magnitude:8.716
V-T magnitude:7.24

Catalogs and designations:
Proper Names
HD 1989HD 66339
TYCHO-2 2000TYC 8570-465-1
USNO-A2.0USNO-A2 0300-03567162
HIPHIP 39119

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