The purpose of the Active Phasing Experiment, designed under the lead of ESO, is to study new phasing technologies and to validate wavefront control concepts for Extremely Large Telescopes. The Active Phasing Experiment is currently tested in the laboratory at the ESO headquarters and will be tested on sky at a Nasmyth focus of a VLT unit telescope

Following the recent reports of activity (ATels #1660, #1664, #1665, #1666) we observed the field of IGR J00291+5934 with the Westerbork Synthesis Radio Telescope (WSRT). The observation was made at 4.9 GHz for about ten hours (from 2008-08-15 20:30 UT to 2008-08-16 06:30 UT). No source is detected at the reported position (ATel #364). We can place

This communication shows the design, layout, mounting and start-up of a high-resolution grating spectrograph for VIS-NIR at GREGOR 1.5m Solar Telescope (Observatorio del Teide, Tenerife, Canary Islands). The instrument will be used together with the Tenerife Infrared Polarimeter (TIP-II). As special characteristics of the design, the following can

This article presents a case study on developing a software product line for data acquisition systems in astronomy based on the Exemplar Driven Development methodology and the Exemplar Flexibilization Language tool. The main strategies to build the software product line are based on the domain commonality and variability, the incremental scope and

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Telescope enclosures are used to limit the disturbance caused by the wind on the pointing and tracking performances of telescopes and to preserve primary mirror optical shape. Within the framework of the EC program "ELT Design Study - Contract No. 011863", extended wind tunnel test have been performed to characterize wind turbulent structure inside