A study is presented of the internal velocity structure of NGC 3656, a galaxy with several morphological signatures of being in an advanced merger stage. Rotation curves obtained for two slit-position angles show that the inner 1 kpc rotates around an axis roughly perpendicular to the rotation axis in the main body of the galaxy. There are

This paper presents near-infrared monitoring, taken with the 1.5 m Carlos Sanchez Telescope in Tenerife and CCD photometry taken with the Jacobus Kapteyn Telescope in La Palma, of the 1988 outburst of 3C 279. This is combined with archival data to examine the behavior of the light curve from B to K.

A brief description of the HEXAFLEX system is presented, which has been contrived to carry out two-dimensional spectroscopy (spectral imaging) in combination with the FLEX spectrograph at the 4.2 m William Herschel Telescope. Some astronomical illustrative examples are shown.

Photon-counting techniques have been applied to a study of the movement of the image of an unresolved star at the 50 cm telescope of the Royal Academy of Sciences, at the Roque de los Muchachos Observatory. The temporal autocorrelation function of such movement has been computed, the results are discussed in terms of atmospheric turbulence and in

Three new young objects have been found when carrying out a survey of IRAS sources with infrared colors like planetary nebulae, via low resolution spectroscopy. IRAS 14592 - 6311 and IRAS 07173 - 1733 are bright cometary nebulae, showing metal line emission very similar to V1331 Cyg, which is the prototype of a certain number of T-Tauri stars. They

The future establishment of large telescopes at the Observatorio del Roque de los Muchachos (ORM) has raised the necessity of designing a site-testing campaign, aimed specifically at selecting their emplacements, as well as characterizing correctly the local seeing behavior and the fluctuations of the turbulent field in the area covered by the