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We show individual high resolution spectra of components A, B, and C of thenearby late-M type multiple system LHS 1070. Component A is a mid-M star, B andC are known to have masses at the threshold to brown dwarfs. From our spectrawe measure rotation velocities and the mean magnetic field for all threecomponents individually. We find magnetic flux on the order of severalkilo-Gauss in all components. The rotation velocities of the two late-M objectsB and C are similar (vsini = 16km/s), the earlier A component is spinning onlyat about half that rate. This suggests weakening of net rotational braking atlate-M spectral type, and that the lack of slowly rotating late-M and L dwarfsis real. Furthermore, we found that magnetic flux in the B component is abouttwice as strong as in component C at similar rotation rate. This indicates thatrotational braking is not proportional to magnetic field strength in fullyconvective objects, and that a different field topology is the reason for theweak braking in low mass objects.

Spectral type dependent rotational braking and strong magnetic flux in three components of the late-M multiple system LHS 1070