Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965bott....4...33i&link_type=abstract
Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 4, pp. 33-40 (1965) (http://www.astroscu.unam.mx/bott/)
Astronomy and Astrophysics
Astronomy
3
Photometry, Surveys
Scientific paper
BYRI photometry in Johnson's system was done for 275 stars the mayority of which are comprised between -25° and -50°. Due to systematic variations in V magnitude in R. A. of the order of 0.2 magnitude it was decided to use in the present work V magnitudes of the Catalogue of the Royal Observatory, Cape of Good Hope, South Africa. The colours presented here, should permit to have an homogeneous R and I Systems of photometry for both the Northern and Southern sky, complete to the fifth magnitude, an up to -50° in declination
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