We present UBV Johnson CCD photometry of two young clusters of the Large Magellanic Cloud (LMC), namely NGC 1850 and NGC 1858, which are located at the NW part of the Bar. We determine their reddening, age and slope of the initial mass function (IMF). The age of NGC 1858 is 8 x 106 yr, while that for the majority of stars in NGC 1850 is 70 x 106 yr

We present Johnson CCD photometry in the B and V passbands for the stellar content of two intermediate age star clusters of the Large Magellanic Cloud (LMC), NGC 2134 and NGC 2249. In total 1613 stars are measured in NGC 2134 and 850 in NGC 2249. With the aid of two grids of stellar models calculated with convective overshoot (both from the core

We have observed 77 evolved planetary nebulae in the J, H, K, L', and M photometric bands. As a consequence, we note that most PN fall into a range -0.6 (J-H)_0_ 0.2 mag , and 0.0 (H-K)_0_ 1.2mag , whilst a few sources have also been detected in the range 1.0 (K-L)_0_ 5.3 mag . Most indices (J-H)_0_ are almost certainly depressed through the

A 60-night campaign on SU UMa, YZ Cnc and some secondary targets was carried out during 1988 December and 1989 January at the Observatorio del Roque de Los Muchachos (the 1988 International Time Project). The aim was to study the behaviour of these dwarf novae through their outburst cycle. Here we present the overall light curves of the main

We present measurements of the apparent rotation curves of the dusty inclined spiral NGC 2146 taken using conventional long-slit spectroscopy in the red and near-infrared. The curve measured in H(alpha) emission shows, with respect to that observed in (S III) lambda9069, a series of dips in velocity which coincide in positions with dips in the

Spectra of four lines (CI5380.3 A, MnI 5394.7 A, FeI 5930.2 A and SiI 5948.5 A) have been obtained in the quiet photosphere, at regular intervals along the polar axis and the equator. The spatially averaged spectra have been analyzed, studying the center-to-limb variation (CLV) and possible changes with the heliographic latitude of the residual