CAOSP abstracts, Volume: 32, No.: 1, year: 2002
- Author(s): PRIBULLA, T.; VANKO, M.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso, vol. 32, no. 1, p. 79-98.
- Date: 04/2002
- Title: Photoelectric photometry of eclipsing contact binaries: U Peg, YY CrB, OU Ser and EQ Tau
- Keyword(s): CONTACT BINARIES, PHOTOMETRY, ORBITAL PERIOD, PHOTOMETRIC ELEMENTS
- Pages: 79 -- 98
Abstract:
New photoelectric UBV observations of the eclipsing contact binary
systems U Peg, YY CrB, OU Ser and EQ Tau obtained from August 2000 to
October 2001 are presented and analyzed. The (O-C) diagram of U Peg
indicates a decrease of the orbital period combined with a quasi-periodic
variation. In the case of EQ Tau the long-term period changes can be
interpreted by the presence of a third body on a 50 year orbit. The present
ephemerides for the studied systems were determined. The primary minimum of
OU Ser, according to the Hipparcos photometry, is found to be the shallower
one and hence the system belongs to the W subgroup. The photometric elements
determined from our light curves combined with published spectroscopic
elements yielded the absolute parameters of the systems.
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