ELMER is a multi-purpose instrument for the GTC designed for both, imaging and spectroscopy in the visible range. The detection subsystem consists of a single E2V Technologies CCD44-82 detector mounted in a LN[2] cooled CCD camera and a SDSU-II CCD controller with parallel interface. The design including the low-noise fan-out electronics has been

The Roque de Los Muchachos Observatory (ORM) played a substantial role in the Deep Impact campaign. Several telescopes were used to follow up comet 9P/Tempel1 before the impact and the five largest telescopes of the ORM were used simultaneously to track the impact itself in an unprecedented way.

Spectroscopic studies of stars with and without planetary systems have concluded that planet hosts are more metal-rich. This enrichment is also seen in the other chemical elements studied and is likely to be primordial in nature. Interesting trends of different chemical elements begin to appear as the number of extrasolar planets continues to grow

We have studied the colors of the bulge component of 133 galaxies from the HST Groth Strip Survey (Groth et al. 1994), covering redshifts 0.3 z 1.0. We selected all objects apparent radii R > 1.4'', and inclination above 50 degrees in order to avoid reddening from dust in the disk on one side of the bulges. We find that, as in the Local Universe

We study the K-correction for the case of emission lines formed in the X-ray-illuminated atmosphere of a Roche lobe-filling star. We compute the K-correction as a function of the mass ratio q and the disk flaring angle α using a compact binary code in which the companion's Roche lobe is divided into 105 resolution elements. We also study the effect

Elmer is a visible imager and spectrograph for the GTC. Elmer Optics has been exhaustively tested at different steps, from the blanks to the final assemblies in order to guarantee the fulfillment with the required performance. In this contribution, we describe the tests done to the different optical components until now. Blank testing, WFE Image