Data on linear optical polarimetry were obtained during two observing runs at the Complejo Astronomico El Leoncito (CASLEO) in San Juan, Argentina, in 2003 (April 29 to May 5 and August 29 to September 2). (1 data file).

We have studied the optical spectra of a sample of 31 O-and early B-type stars in the Small Magellanic Cloud, 21 of which are associated with the young massive cluster NGC 346. Stellar parameters are determined using an automated fitting method (Mokiem et al. 2005, A&A, 441, 711), which combines the stellar atmosphere code FASTWIND (Puls et al

In this presentation we report visible and near infrared spectra covering the 0.35-2.5 μm range of two big TNOs recently discovered, 2005 FY9 and 2003 EL61, and visible spectrum of 2003UB313 obtained with the 4.2 m William Herschel Telescope and the 3.58 m Telescopio Nazionale Galileo sited at El Roque de Los Muchachos Observatory (La Palma, Spain)

Context. Star-forming nuclear rings in barred galaxies are common in nearby spirals, and their detailed study can lead to important insights into the evolution of galaxies, their bars and their central regions. We present integral field spectroscopic observations obtained with SAURON of the bar and circumnuclear region of the barred spiral galaxy

The study of asteroids that present sporadic cometary activity, is of fundamental importance to address several astronomical problems like the end states of comet nuclei, the abundance of water in main belt asteroids and its role as a possible source of terrestial water. We studied the composition of the surface of asteroid (3200) Phaethon, a

We report the detection of the first extrasolar planet, ET-1 (HD 102195b), using the Exoplanet Tracker (ET), a new-generation Doppler instrument. The planet orbits HD 102195, a young star with solar metallicity that may be part of the local association. The planet imparts radial velocity variability to the star with a semiamplitude of 63.4+/-2.0 m