It is shown that supernova explosions inside wind-driven cavities created by progenitors moving across the ambient medium result in a large diversity of remnant structures. In particular, barrel-like remnants can be explained as a result of an off-centered explosion within an almost spherical cavity, whereas explosions in strongly elongated

The Department of Detectors of the Instituto de Astrofisica de Canarias, Spain is developing a data acquisition system (DAS) for an infrared camera based in a 256 X 256 InSb detector. The camera is going to work from 1 to 5 microns wavelength, with a scale on the sky of 0.5 arcsec per pixel, and will be installed as a common user instrument at the

The H-alpha emission star BD + 24 deg 676, formerly classified as a T Tauri star and more recently as a Herbig Ae star, has been observed at moderately high resolution in the red spectral region. The main results are: the metallic lines over the wavelength range 6400-6750 A have equivalent widths comparable to early G stars; the radial velocity is

A NLTE-analysis is presented of high S/N spectra of the optical component of the standard massive X-ray binary Vela X-1. In combination with the orbital parameters we conclude that the optical star is highly helium enriched and is significantly overluminous compared to standard evolutionary tracks of massive accretion stars. We then propose a new

We have undertaken high resolution spectroscopy and IR photometry of the extended planetary nebula Sh 2-71. As a consequence, we note evidence for a discoidal expanding emission region size about 100 arcsec, tilted to the line of sight, and enveloping a core high-excitation source associated with velocities about +/- 500 km/s. Both NIR and optical

We describe work that has recently been completed on deriving the fundamental parameters of eight WR stars through the photoionization modelling of their surrounding nebulae using non-LTE WR flux distributions. The resulting effective temperatures range from 57 000 71 000 K for the WN4-5 stars and