Abstract


  LONG-TERM MULTI-BAND STUDIES OF ULTRA-FAST ROTATOR LO PEG

  S. Karmakar, Aryabhatta Research Institute of observational sciencES (ARIES), subhajeet@aries.res.in
  J. Pandey, Aryabhatta Research Institute of observational sciencES (ARIES), jeewan@aries.res.in

With 25 years multi-band data, we found short-term and long-term
variability in K2 type ultra-fast rotator LO Peg. The short-term
variability is due to rotational modulation with a period of
0.422923$\pm$0.000005 days. During the observations $\sim$22
flares were detected in optical V-band. Energy of these flares are
found to be of the order of $10^{33-34}$ erg. We generate the
surface map using V band data and found that spots on the surface
are changing their position continuously with a period of
$\sim$6.8 years. The surface coverage of the spots varies in the
range of 6 to 26 per cent, whereas the amplitude of the light
curve varies in the range of 0.04 to 0.16.