E. Kuczawska et M. Mikolajewski, 2 DIFFERENT PERIODS PRESENT IN THE BINARY NUCLEUS OF THE PLANETARY-NEBULA LOTR5, Acta Astronomica, 43(4), 1993, pp. 445-453
We present new photoelectric UBV observations of IN Com - the binary n
ucleus of the planetary nebula LoTr5, carried out in April 1993 with t
he double beam photometer at Mt. Suhora Observatory. Low-amplitude var
iations were detected with a period of about 5.d92, in agreement with
the results of Noskova (1989) and Bond and Livio (1990), but also high
er frequency variability was discovered. A preliminary ephemeris is gi
ven. We speculate on the origin of the observed variabilities.