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HD 90219


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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:Kiel des Schiffs
Right ascension:10h23m05.19s
Declination:-61°15'56.4"
Apparent magnitude:7.489
Distance:613.497 parsecs
Proper motion RA:-9
Proper motion Dec:6.8
B-T magnitude:9.106
V-T magnitude:7.623

Catalogs and designations:
Proper Names
HD 1989HD 90219
TYCHO-2 2000TYC 8956-1424-1
USNO-A2.0USNO-A2 0225-08299056
HIPHIP 50855

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