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HD 45538


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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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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Masa
Sað Açýklýk:06h19m22.26s
Yükselim:-75°42'00.5"
Görünürdeki Parlaklýk:7.914
Uzaklýk:210.526 parsek
özdevim Sað Açýklýk:60.8
özdevim Yükselim:-18
B-T magnitude:9.329
V-T magnitude:8.031

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 45538
TYCHO-2 2000TYC 9379-1700-1
USNO-A2.0USNO-A2 0075-01156073
HIPHIP 30048

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