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HD 159046


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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:Autel
Right ascension:17h37m25.27s
Declination:-66°31'18.4"
Apparent magnitude:7.55
Distance:221.729 parsecs
Proper motion RA:-35.2
Proper motion Dec:-1.3
B-T magnitude:9.107
V-T magnitude:7.679

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 159046
TYCHO-2 2000TYC 9065-2880-1
USNO-A2.0USNO-A2 0225-27978704
HIPHIP 86242

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