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HD 157873


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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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观测天体数据

星座:天壇座
右阿森松:17h29m16.81s
赤纬:-57°24'42.4"
视星:8.007
距离:344.828 天文距离
右阿森松适当运动:-0.7
赤纬适当运动:-8
B-T magnitude:9.313
V-T magnitude:8.115

目录:
适当名称
HD 1989HD 157873
TYCHO-2 2000TYC 8736-678-1
USNO-A2.0USNO-A2 0300-31761406
HIPHIP 85577

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