Borja Toledo-Padron
  
  Instituto de Astrofisica de Canarias
  
  Disentangling the stellar activity of Barnard's Star
  
  Among the nearby stars, the properties of Barnard's Star (GJ 699) make it a prime target for the search of Earth-like planets using ultra-stable spectrographs. This search requires a very precise characterization of the stellar activity and the magnetic cycle of the star since these phenomena induce radial velocity signals that can be misinterpreted as planetary signals. We have carried out a characterization of these phenomena using a set of spectroscopic data that covers about 14.5 years and comes from seven different spectrographs: HARPS, HARPS-N, CARMENES, HIRES, UVES, APF, and PFS; and a set of photometric data that covers about 15.1 years and comes from four different photometric sources: ASAS, FCAPT-RCT, AAVSO, and SNO.  I will present our analysis that reveals a rotation period of 145 days, which is consistent with the expected rotation period according to the low activity level of the star and provides an activity-induced RV signal of about 1 m/s. I will also show the analysis of different activity proxies that allow us to find evidence of a long-term cycle of 10 years. I will compare these results with previous estimates of rotation periods and magnetic cycles in other M stars of similar activity levels.