Extensive spectroscopic studies of stars with and without planetary systems have concluded that planet host stars are more metal-rich than those without detectable planets. More subtle trends of different chemical elements begin to appear as the number of detected extrasolar planetary systems continues to grow. I review our current knowledge

We present the [X/H] trends as a function of the elemental condensation temperature Tc in 88 planet-host stars and in a volume-limited comparison sample of 33 dwarfs without detected planetary companions. We gathered homogeneous abundance results for many volatile and refractory elements spanning a wide range of Tc, from a few dozen to several

Since the discovery of the first extrasolar planet 51 Pegb [1] more than 190 extrasolar planets have been detected in orbit around other stars by means of precise stellar radial velocity (RV) measurements. But all RV surveys are concentrating almost entirely on solar-type stars covering only a narrow spectral and stellar mass range (spectral type

We describe the status of a project whose main goal is to detect variability along the extreme horizontal branch of the globular cluster NGC 6752. Based on Magellan 6.5-m data, preliminary light curves are presented for some candidate variables. By combining our time-series data, we also produce a deep CMD of unprecedented quality for the cluster

Not Available

Up to now our knowledge on frequency of planets of stars that are more massive than the sun is rather limited. In here we present the discovery of a planet orbiting the F4V-F6V star 30 Ari B, which is also a member of a hierarchical triple-star system.