UBV(RI)C photometry of equatorial standard stars. A direct comparison between the northern and southern systems

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Abstract

We present UBV( RI )C photometry of 212 stars from Landolts list of equatorial standards is presented. The observations are tied to the system defined by Cousin’s E-region standards. A comparison of the present results with Landolt’s reveals reasonably good agreement for ( V–R )C and ( V – I)C, but marked systematic differences for ( B – V ) and ( U – B). and The UBV systems of Cousins and Landolt are evidently not the same and both probably differ from Johnson’s original system.

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