UBVRI Photometric Standard Stars around the Sky at -50° Declination

Abstract

UBV RI photoelectric observations have been made of 109 stars around the sky, and centered more or less at −50 degrees declination. The majority of the stars fall in the magnitude range 10.4 < V < 15.5, and in the color index range −0.33 < (B − V ) < +1.66. These new broad-band photometric standard stars average 16.4 measures each from data taken on 116 different nights over a period of four years. Similar data are tabulated for 19 stars of interest, but which were not observed often enough to make them well-defined standard stars.