Four-colour observations of primary and secondary UVBY standards

Astronomy and Astrophysics – Astronomy

Scientific paper

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A Stars, Stellar Color, Stellar Spectrophotometry, Ubv Spectra, Data Acquisition, Data Processing, Error Analysis, Milky Way Galaxy, Spectrum Analysis, Standards

Scientific paper

Strömgren uvby photometry of primary standards and of the secondary standards observed by Cousins (1985), in the E regions and by Twarog (1984), near the South Galactic Pole suggests that the Twarog c1 results are not on the standard system. Inconsistencies also occur in V and m1 but it is not clear from which data these arise. Intercomparisons discussed in this paper and by Eggen suggest that systematic errors, particularly in m1 and c1, could be widespread in southern hemisphere uvby observations.

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