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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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관측 및 측정 데이터

별자리:제단자리
적경:17h29m16.81s
적위:-57°24'42.4"
가시등급:8.007
거리:344.828 파섹
적경상의 고유운동:-0.7
적위상의 고유운동:-8
B-T magnitude:9.313
V-T magnitude:8.115

천체목록:
일반명   (Edit)
HD 1989HD 157873
TYCHO-2 2000TYC 8736-678-1
USNO-A2.0USNO-A2 0300-31761406
HIPHIP 85577

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