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HD 152025


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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.

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观测天体数据

星座:天壇座
右阿森松:16h53m50.01s
赤纬:-54°21'48.4"
视星:7.459
距离:505.051 天文距离
右阿森松适当运动:-24.8
赤纬适当运动:-34.5
B-T magnitude:9.122
V-T magnitude:7.597

目录:
适当名称   (Edit)
HD 1989HD 152025
TYCHO-2 2000TYC 8726-2091-1
USNO-A2.0USNO-A2 0300-29908948
HIPHIP 82660

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