THE SARG SEARCH FOR PLANETS: FIRST RESULTS

摘要

We present the results of 2 years of high precision radial velocity monitoring of a sample of visual binaries performed at Telescopic Nazionale Galileo (TNG) using the high resolution spectrograph SARG. In particular we describe the results obtained for the HD 219542 system. The A component of this binary system was found to have a 0.1 dex higher metallicity than the B component (Gratton et al. 2001) but no velocity variations above the measurement errors (5 m/s) were detected. On the other hand the B component of HD 219542 shows a low amplitude variation with a period of 112 days suggesting a Saturn-mass planet. The results of stellar activity tests made are inconclusive and alternative interpretation can not be excluded.