The initial instrumentation of the 1.5 m solar telescope GREGOR on Tenerife will include a grating spectrograph with a spectro-polarimeter for the near infrared and a dual Fabry-Perot filter spectro-polarimeter for the "red" wavelength range from 530 to 860 nm. Both instruments are based on their predecessors that are presently operated at the

We present an overview of the conceptual design of the data handling unit of the ECS, the Control System for the European Solar Telescope (EST). We will focus on describing the critical requirements for this unit resulting from the overall design of the telescope, together with its architecture and the results of the feasibility analysis carried

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Highly ionized gas has been detected at large distances from the nucleus in several classes of active galaxies. There is evidence that photoionization by the active nucleus may be the most relevant mechanism for the observed ionization. The spatial distribution of such gas has a conical shape, whose vertex points towards the nucleus and the axis is

Evolutionary synthesis models are a fundamental tool to interpret the properties of observed stellar systems. In order to achieve a meaningful comparison between models and real data, it is necessary to calibrate the models themselves, i.e. to evaluate the dispersion due to the discreteness of star formation as well as the possible model errors. In

We have confirmed the detection of a surprising, and so far unique, absorption feature on a main-belt asteroid, 24 Themis. Our 2 to 4 micron reflectance spectra were obtained over 7 hours (84% of Themis’ rotational period) on January 23, 2008 UT, from NASA's Infrared Telescope Facility. All our spectra confirm the shape and depth of the 3.1 micron