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Photometric Observations of LO Peg in 2014-2015

Savanov I. S., Puzin V. I., Dmitrienko E. S., Karpov S. V., Beskin G. M., Biryukov A. V., Bondar S. F., Ivanov E. A., Katkova E. V., Orekhova N., Perkov A. V., Sasyuk V. V., Romanyuk I. I., Semenko E. A., Kudryavtsev D., Karmakar S., Pandey J. C., Pandey S. B., Joshi S., Misra K.

Acta Astronomica

2016

Vol. 66, No. 3

381--390

We performed new observations of an ultra-fast rotator of the spectral class K - the LO Peg star - in SAO RAS in 2014 and in Zvenigorod Observatory of INASAN in 2015. The light curves were used to build the maps of temperature inhomogeneities on the LO Peg surface in order to determine the longitudes corresponding to the location of active regions. The obtained measurements suggest the ongoing evolution of movements of active regions and probably the cyclic character of such movements. According to our estimations, the area of the star surface covered with spots decreases and by now it reached 14% of the total visible area of its surface. New observations of the star in V filter allowed us to specify LO Peg long-term variability cycles. Based on spectropolarimetric observations of LO Peg the null result for measurements of mean longitudinal component of magnetic field is obtained.

Variability of the Ap Star HD 9996

Bychkov V. D., Bychkova L. V., Madej J., Shatilov A. V.

Acta Astronomica

2012

Vol. 62, No. 3

297--311

We present here new measurements of the longitudinal magnetic field (Be) in the binary system HD 9996, where the primary companion is an Ap star. Series of 63 Be observations was obtained in years 1994-2011 with the 1-m optical telescope of the Special Astrophysical Observatory (Russia). New magnetic data allowed us to refine the long-term magnetic period of HD 9996 to Pmag=21.8 years. Compilation of archival photometric data showed the existence of long-term variations of HD 9996 in time scale of 22-23 yr consistent with Pmag. We identify Pmag with the precession period of the primary Ap star and summarize search for a short-term rotational period and the rotational line broadening in this star.