4 COLOR PHOTOMETRY OF LATE-TYPE BINARY-SYSTEMS .2. NEW LIGHT CURVES OF BH-VIRGINIS

This paper presents new complete uvby light curves of the late-type de tached eclipsing binary BH Vir (G0V + G5V, P = 0.(d)81687099). This bi nary system has been observed during four campaigns at the Calar Alto Observatory (Almeria, Spain) and at the European Southern Observatory (La Silla, Chile). This observations are part of a 6 year uvby and H b eta monitoring program of low mass eclipsing binaries which main objec tive is to provide accurate absolute astrophysical parameters for late -type main sequence stars. 1585 points spreaded over the binary period and covering both eclipses are given. The internal accuracy of the st andard photometry measured as the mean RMS of the differences between standard value and observed value for the standard stars observed alon g the program is quoted in a few millimagnitudes. Detailed analysis of BH Vir, based on these light curves, will be published separately.