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HD 130721


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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:Circinus
Right ascension:14h53m24.66s
Declination:-68°23'29.8"
Apparent magnitude:7.548
Distance:172.117 parsecs
Proper motion RA:-38.9
Proper motion Dec:-27.3
B-T magnitude:9.104
V-T magnitude:7.677

Catalogs and designations:
Proper Names
HD 1989HD 130721
TYCHO-2 2000TYC 9258-2051-1
USNO-A2.0USNO-A2 0150-14087591
HIPHIP 72850

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