We obtained deep optical imaging of the Alpha Per open cluster using the KPNO 4-m CCD mosaic camera, MOSA, on November 19-22 1998. All of the images were obtained with the facility R and I filters. In addition to the KPNO/MOSA observations, we undertook several infrared observing campaigns at the Hispano-German Calar Alto Observatory in order to

The optical design for the proposed Euro50 extremely large telescope with integrated adaptive optics (AO) is presented. For atmospheric turbulence correction, we propose using single and dual-conjugate AO systems working with natural and laser guide stars. The corrective shape of the deformable mirrors (DMs) is derived from an analytical algorithm

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We report on the 323 hours of nearly uninterrupted time series photometric observations of the DBV star GD 358 acquired with the Whole Earth Telescope (WET) during May 23 to June 8, 2000. We acquired more than 232000 independent measurements and detected the non-radial g-modes consistent with degree l=1 and radial order 8 to 20 and their linear