Magnetic properties of solar twins
P. Petit, B. Dintrans, et al.

Abstract: The accuracy of new stellar spectropolarimeters enables magnetic field measurements on solar twins, i.e. stars with fundamental parameters (mass, age, rotation rate) very close to the Sun's and characterized by a similarly low activity level. Magnetic field measurements on solar twins will tell us how typical the Solar magnetic cycle is, compared to other objects of its class. From such approach, it will also be possible to determine to what extent stellar magnetic properties can be sensitive to small departures from the solar location in the stellar parameter space. We propose to initiate a systematic high S-N monitoring of a sample of solar twins, with typical accuracy better than 1 Gauss. NARVAL will be used for stars brighter than mV=7 and ESPaDOnS will be dedicated to fainter targets (mV between 7 and 9). All stars from this sample will be monitored over one decade, in order to cover most of their magnetic cycle.