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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: | Sunak |
| Sað Açýklýk: | 17h37m25.27s |
| Yükselim: | -66°31'18.4" |
| Görünürdeki Parlaklýk: | 7.55 |
| Uzaklýk: | 221.729 parsek |
| özdevim Sað Açýklýk: | -35.2 |
| özdevim Yükselim: | -1.3 |
| B-T magnitude: | 9.107 |
| V-T magnitude: | 7.679 |
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