Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..436c&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 699, p. 436-443
Astronomy and Astrophysics
Astronomy
17
Abundance, Astronomical Photometry, Calibrating, Stellar Temperature, Temperature Dependence, Temperature Measurement, Astronomical Observatories, Giant Stars, Late Stars, Open Clusters, Stellar Evolution
Scientific paper
A revised effective-temperature calibration for the David Dunlap Observatory (DDO) photometric system is presented. Recently published photometric and spectroscopic observations of field and open-cluster G and K stars allow a better definition of the solar-abundance fiducial relation in the DDO C0(45-48) vs. C0(42-45) diagram. The ability of the DDO system to predict MK spectral types of G and K giants is demonstrated. The new DDO effective temperature calibration reproduces satisfactorily the infrared temperature scale of Bell and Gustafsson (1989). It is shown that Osborn's (1979) calibration underestimates the effective temperatures of K giants by approximately 170 K and those of late-type dwarfs by approximately 150 K.
Claria Juan J.
Lapasset Emilio
Piatti Andrés E.
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