UV Ceti - type variables
- UV - Eruptive variables of the UV Ceti type, these are K Ve-M Ve stars
sometimes displaying flare activity with amplitudes from
several tenths of a magnitude up to 6 mag in V. The amplitude is
considerably greater in the ultraviolet spectral region. Maximum
light is attained in several seconds or dozens of seconds after
the beginning of a flare; the star returns to its normal
brightness in several minutes or dozens of minutes.
- UVN - Flaring Orion variables of spectral types Ke-Me. These are
phenomenologically almost identical to UV Cet variables observed
in the solar neighborhood. In addition to being related to
nebulae, they are normally characterized by being of earlier
spectral type and greater luminosity, with slower development of
flares (V389 Ori). They are possibly a specific subgroup of INB
variables with irregular variations superimposed by flares.
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