We have measured the brightness of the optical counterpart of the black hole X-ray binary Nova Sco 1994 (GRO J1655-40) during 40 nights between 1995 May 3 and July 27. From our observations and data from the literature we refine the orbital period to be 2.620 40+/-0.000 98 d. We model the R-band light curve as primarily arising from an X-ray heated

IAUC 6621 available at Central Bureau for Astronomical Telegrams.

Not Available

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