Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasa...24...61m&link_type=abstract
Publications of the Astronomical Society of Australia, Volume 24, Issue 2, pp. 61-68.
Astronomy and Astrophysics
Astronomy
3
Stars: Binaries Eclipsing, Stars: Individual, Sw Cyg
Scientific paper
The O-C curve of the Algol-type eclipsing binary SW Cyg was analyzed using the Kalimeris method. The observed period variations with time, the P(E) function and its rate of change dP/dE, were calculated. The plots of O-C values as well as of P(E) and dP/dE against ephemeris (E) all show rather regular period variations in this system. To reveal any cyclic period variations, the P(E) function was subjected to Fourier analysis. A cyclic period change of average ~27.8-yr duration was obtained. Also a relative mass transfer rate of Δm/m = -1.1 × 10-9 yr-1 was estimated. Finally the existence of a third companion is suggested, and possible causes of period variations in the system are discussed.
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