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Absolute parameters for binary systems. II. The late-type system ZZ Ursae Majoris
New light curves of the late-type binary system ZZ UMa were obtainedduring a uvby and H beta monitoring program on low mass eclipsingbinaries, that has been carried out in a six year photometricobservational program \cite[(Clement et al. 1997a]{cle97a}, Paper I).The main goal of the program is to obtain accurate absolute parametersfor stars in the low and intermediate mass range, in order to improvethe Mass-Luminosity Relationship (MLR) at the end of the main sequence.This paper presents a complete analysis of the first uvby beta lightcurves of the late-type detached eclipsing binary ZZ UMa. This binarysystem has been observed during eight campaigns at the Calar AltoObservatory (Almeria, Spain). The activity wave superposed on theeclipse light curve has been estimated, by using a new iterative fittingmethod \cite[(Clement et al. 1997b]{cle97b}, Paper II). Theinterpretation of the wave suggests the existence of two active zones ofsimilar intensity, separated by areas at higher temperature. Once theactivity wave was subtracted from the light curves, we adjusted thegeometrical solution using the EBOP code. Radiative parameters for bothstars have been derived from the light curves. Combining the massesdeduced from the radial velocity curves \cite[(Popper 1995)]{pop95},with the calculated geometrical and radiative values, we computed theabsolute parameters for both components. We can conclude that the systemis composed of two main sequence G-type stars with masses, radii andchemical composition similar to the Sun.
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Observation and Astrometry data
| Constellation: | Andromeda |
| Right ascension: | 02h28m33.77s |
| Declination: | +41°44'56.4" |
| Apparent magnitude: | 9.196 |
| Proper motion RA: | -2.8 |
| Proper motion Dec: | -6.2 |
| B-T magnitude: | 9.235 |
| V-T magnitude: | 9.2 |
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