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Variability type BY (from B/gcvs/vartype.txt)

BY     BY Draconis-type variables, which are emission-line dwarfs of dKe-dMe
       spectral type showing quasiperiodic light changes with periods
       from a fraction of a day to 120 days and amplitudes from several
       hundredths to 0.5 mag in V. The light variability is caused by
       axial rotation of a star with a variable degree of nonuniformity
       of the surface brightness (spots) and chromospheric activity.
       Some of these stars also show flares similar to those of UV Cet
       stars, and in those cases they also belong to the latter type and
       are simultaneously considered eruptive variables.

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