In this paper we review the current situation regarding the study of the metallicity-giant planet connection. We show that planet-host stars are more metal-rich than average field dwarfs, a trend that remains after the discovery of now more than about 100 planets. Current results also point out that the planetary frequency is rising as a function

We present results of photometric observations of the high-amplitude EC 14026-type star, Balloon 090100001. The data were obtained in broad-band B filter and span over five weeks, consisting of about 150 hours of observations. Fourier analysis of these data led us to the detection of at least 50 modes of pulsation, out of which 37 are independent

The advantages of using a telescope of large aperture, like the GTC, for mid-infrared imaging are demonstrated. Examples are given to compare the characteristics of the images in the 8 to 13 μ m regime recently taken with the 2.1 m telescope at San Pedro Mártir with those obtained with a 10 meter class telescope. Finally, 10μ m images of the BN/KL

This paper presents the results of a detailed X-ray spectral analysis of a sample of 123 X-ray sources detected with XMM-Newton in the Lockman Hole field. This is the deepest observation carried out with XMM-Newton with more that 600 ks of good EPIC-pn data. We have spectra with good signal to noise (>500 source counts) for all objects down to 0.2

In this paper we review some recent detections of wide binary brown dwarf systems and discuss them in the context of the multiplicity properties of very low-mass stars and brown dwarfs.

This project addresses the reasons that may motivate efforts to popularize astronomy. Data relevant to this research question were collected by means of focus groups involving professional astronomers at a large Spanish research institute, followed by a questionnaire to the same group of people. The data showed that the main driver for astronomy