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HD 123775


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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:半人馬座
右阿森松:14h11m23.13s
赤纬:-56°22'58.1"
视星:7.231
距离:284.9 天文距离
右阿森松适当运动:-57.2
赤纬适当运动:-37.1
B-T magnitude:9.047
V-T magnitude:7.381

目录:
适当名称   (Edit)
HD 1989HD 123775
TYCHO-2 2000TYC 8673-4146-1
USNO-A2.0USNO-A2 0300-20588769
HIPHIP 69331

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