UVBY-BETA PHOTOMETRY OF ALL STARS EARLIER THAN GO AND BRIGHTER THAN MPG-APPROXIMATE-TO-10.M3 IN SELECTED AREA-194

Four-colour and Hbeta photometry is introduced for 594 stars earlier t han GO in the Kapteyn's Selected Area 194. The results give V, b - y, m1, c1, and beta on the standard systems, with overall rms errors for one observation of one star of 0.009m, 0.004m, 0.006m, 0.009m, and 0.0 09m, respectively. The data cover an area of about 5-degrees x 5-degre es and is intended for an investigation of the distribution of the int erstellar medium toward the northern part of the Southern Coalsack and its surroundings. A comparison to earlier results obtained by other a uthors has shown that the c1 indices obtained for the late type stars were underestimated, in average, by 0.020m. Since such difference may account for an error of little more than 10% in the estimated stellar distances, a correction was applied to the c1 index of these stars.