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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.

Untersuchungen an Farbenindizes II. Mit 1 Textabbildung
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Observation and Astrometry data

Constellation:Autel
Right ascension:16h53m50.01s
Declination:-54°21'48.4"
Apparent magnitude:7.459
Distance:505.051 parsecs
Proper motion RA:-24.8
Proper motion Dec:-34.5
B-T magnitude:9.122
V-T magnitude:7.597

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 152025
TYCHO-2 2000TYC 8726-2091-1
USNO-A2.0USNO-A2 0300-29908948
HIPHIP 82660

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