Broadband UBVRI and narrowband H alpha and continuum images have been obtained for the Hickson compact group HCG 31 as part of an ongoing program devoted to the study of the star formation properties of galaxies in these groups. A spatially resolved analysis for the (U-B), (V-I), and (B-I) color maps has been performed, as well as for the U band, H

In the paper Model Color-Magnitude Diagrams for Hubble Space Telescope Observations of Local Group Dwarf Galaxies by A. Aparicio, C. Gallart, C. Chiosi, & G. Bertelli (ApJ, 469, L97 [1996]), there is an error in the legend to Figure 2. The information for panels C and D was interchanged in the legend. The correct information is given at the bottom

We present microvariability observations of OJ 287, taken during a small flare in January 1994. We can follow the behaviour of OJ 287 during the whole flare. The event has a synchrotron flare shape, with a steep ingress and slower egress, and a double peak structure most likely due to two similar flares occurring a day apart. Microvariability is

IAUC 6635 available at Central Bureau for Astronomical Telegrams.

IAUC 6634 available at Central Bureau for Astronomical Telegrams.

We use statistical data giving the number of stars formed as a function of the age, assigned using the observed deterministic relation between chromospheric activity and age, to show that the temporal behaviour of star formation in the solar neighbourhood must have been chaotic during time intervals of less than 1 Gyr. We also offer evidence that