UVBY-BETA PHOTOMETRY OF 1017 STARS EARLIER THAN G0 IN THE CENTAURUS-CRUX-MUSCA-CHAMELEON DIRECTION

Stromgren uvby beta photometry has been collected for a total of 1017 stars earlier than GO lying in an area of the sky containing the South ern Coalsack, the Musca, and the Chamaeleon dark clouds. The targets w ere selected from the SAO star catalog, and the results, which are onl y available in electronic form at the CDS, give V, b - y, m(1), c(1), and beta on the standard systems, with overall rms errors for one obse rvation of one star of 0.008(m), 0.004(m), 0.006(m), 0.009(m), and 0.0 11(m), respectively. The observational data introduced here is aimed f or an investigation of the colour excess distribution in direction to the mentioned dark clouds as well as to the interstellar medium surrou nding them.