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Context. Long-term chromospheric activity in slow-rotating fully-convectivestars has been scarcely explored. Ross 128 (Gl 447) is a slow-rotator andinactive dM4 star which has been extensively observed. It hosts the fourthclosest extrasolar planet. Aims. Ross 128 is an ideal target to test dynamotheories in slow-rotating low-mass star. Methods. To characterize the magneticactivity of Ross 128 we study the SK indexes derived from CASLEO, HARPS, FEROS,UVES and XSHOOTER spectra. Using the Generalized Lomb-Scargle and CLEANperiodograms, we analyze the whole SK time-series obtained between 2004 and2018. We perform a similar analysis for the Na I index and we analyze itsrelation with the SK-index. Results. From both indexes, we obtain a possibleactivity cycle with a 5-year period, which is one of a small handful ofactivity cycles reported for a slow-rotating fully convective star.

Ross 128 -- GL 447A possible activity cycle for a slow-rotating fully-convective star