We present long-slit optical spectra along the major axis of the planetary nebula NGC 7009. These data allow us to discuss the physical, excitation, and chemical properties of all the morphological components of the nebula, including its remarkable systems of knots and jets. The main results of this analysis are the following: (1) the electron

The imager on board INTEGRAL (IBIS) presently provides the most detailed sky images ever obtained at energies above 30 keV. The telescope is based on a coded aperture imaging system which allows to obtain sky images in a large field of view (29deg x 29deg) with an angular resolution of 12'. The System Point Spread Function of the telescope and its

Here we present two-dimensional hydrodynamic calculations of free expanding supergalactic winds, taking into consideration strong radiative cooling. Our main premise is that supergalactic winds are powered by collections of super-star clusters, each of which is a source of a high-metallicity supersonic diverging outflow. The interaction of winds

We present the first simultaneous infrared (IR) and visible spectropolarimetric observations of a solar internetwork region. The Fe I lines at 6301.5, 6302.5, 15648, and 15652 Å were observed, with a lag of only 1 minute, using highly sensitive spectropolarimeters operated in two different telescopes (Vacuum Tower Telescope and THEMIS at the

Spectroscopic redshifts for 132 galaxies in the central region of the galaxy cluster Abell 2219 are presented. For each galaxy equatorial coordinates, total R magnitude and B-R colour (Harris filters), and velocity are given. Where available, we also give a code for the spectral classification. (1 data file).

The Ariel-5 X-ray transient A1744-36 and the newly-discovered transient XTE J1748-361 may be identical (ATEL #204). Based on a 16 ks Chandra ACIS-S observation of A1744-36 made on 2003 May 28, the position of this source is RA(J2000) = 17:48:19.22, Dec(J2000) = -36:07:16.6 (uncertainty < 1").