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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: | Πτηνόν |
| Right ascension: | 16h23m02.32s |
| Declination: | -71°55'06.4" |
| Apparent magnitude: | 7.775 |
| Distance: | 159.744 parsecs |
| Proper motion RA: | 1.9 |
| Proper motion Dec: | -51.5 |
| B-T magnitude: | 9.393 |
| V-T magnitude: | 7.909 |
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