6533b81ffe1ef96bd1277a70

RESEARCH PRODUCT

Four colour photometry of late-type binary systems

subject

description

This paper presents rst complete uvby light curves of the late-type detached eclipsing binary ZZ UMa (G0V + G8V, P =2 : d 2993). This binary system has been observed during eight campaigns at the Calar Alto Observatory (Almeria, Spain)and at the Sierra Nevada Observatory (Granada, Spain). 294 points distributed over the binary period and covering both eclipses are given. The comparison stars used to calculate the dierential light curves (SAO 15242 and SAO 15251) were conrmed as being good reference stars with constant flux. These observations are part of a 6 year uvby and H monitor- ing program of low mass eclipsing binaries whose main objective is to provide accurate absolute astrophysical pa- rameters for late-type main sequence stars. Details about the standardisation process and accuracy of the photom- etry are also given. The internal accuracy of the standard photometry measured as the mean RMS of the dierences between standard and observed values for the standard stars observed along the program is only a few millimag- nitudes. Detailed analysis of ZZ UMa, based on these light curves, will be published separately.