[en] We present 143 micrometer measurements of 58 double stars observed with the 152 cm telescope at the National Astronomical Observatory, Calar Alto (Almeria, Spain). This is the first published list of observations of this kind made with this telescope

[en] From a series of observations in the visual band-pass the light curve of this system has been derived. The peculiarities of the light curve indicate the presence of luminous and obscuring clouds and/or gas streams. In addition we found evidence for small dips in the light curve which may be caused by transits of a third body across the disk of one of the two stars. (author)

No abstract available

[en] Observations of a possible eclipse in the 20 Leo system are reported. A discussion of the possible implications on this interesting triple system is also presented

[en] We present new UBV photometry of the long-period RS CVn-type binary HK Lacertae carried out in 1981 and 1982. Although there are gaps in the data, we covered about six complete cycles each in 1981 and 1982. The shape, maximum and minimum levels, amplitude, mean brightness, asymmetry-and period of the light curve all show strong variations. The oscillations in the photometric period seem undoubtable due to the varying asymmetry in the light curve. The color-independent, complex light variation was interpreted in terms of the rearrangement of two magnetically active regions without any sizeable variation of the activity level on the surface of the visible component. Probable small increase in amplitude towards shorter wavelenghts was thought to be due to brightening by the plage effect

[en] The relative positions of components of the double star ADS 11632 are obtained from observations with the 26'' refractor at Pulkovo in 1961-1982. The resUlts are compared with the Washington, Dearborn and Flagstaff series. The perturbations from an unseen companion with a period of 5 years and amplitude of about 0''.0.1 can assume

[en] Limiting photometric solutions for the system CD Eri in B and V filters have been obtained. The secondary minimum was found to be absent. (orig.)

[en] Relative positions for 36 nearby binary stars, measured on plates obtained with the Lick 91-cm refractor, are presented. Photovisual magnitude differences for 27 of these are also given along with photoelectric measures for 14 pairs. A short discussion of the precision of photographic double-star measurements with the Lick Automatic Measuring Engine is also included

[en] It is shown that the discontinuity model of Shu, Lubow and Anderson for contact binary stars contains serious internal inconsistencies which prove fatal to the model. (author)

[en] Complete uvby light curves are presented for the bright, southern, A-type triple system V1031 Orionis which consists of two well-separated eclipsing components in a circular orbit and a third component at an angular distance of about 0.16 sec. The light curves contain 1280 points in each colour, obtained from 1980 to 1983