The large telescope planned for the Observatorio del Roque de los Muchachos will include an adaptive optics (AO) facility, designed to provide diffraction-limited images in the near infrared. The telescope itself is being designed to allow optimal performance of the AO system. The optical errors of the segmented primary mirror will be specified

Erratum to Astron. Astrophys. 306, 960 (1996).

IAUC 6558 available at Central Bureau for Astronomical Telegrams.

This article presents Hα and [O iii] narrow-band images and long-slit optical and near-infrared spectroscopy at position angles 65.5 deg and 25 deg through the circumnuclear region in the Seyfert 1 galaxy NGC 3227. After subtraction of a bulge+disc model, the continuum image at lambda5900A shows an excess of emission aligned with the companion

We present the velocity field of the stars in the central 25″ × 22″ of NGC 1068 derived from 2-D spectroscopy of the Ca II triplet. A preliminary analysis provides evidence for two distinct stellar systems in the centre of NGC 1068. In the outer regions (say r > 10″), the mean stellar velocity field seems coupled to those of the ionized and

Using broad band photometry, a new method is derived to evaluate relative (arm with respect to the interarm disk) star formation rates and relative star formation efficiencies together with spiral arm amplitudes, as a function of the galactocentric radius. The classical method to obtain star formation rates from Hα photometry is discussed, and a