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Orbital Period Modulation in SW Cygni

Published online by Cambridge University Press:  05 March 2013

Davood Manzoori
Davood Manzoori*
Affiliation:
Department of Physics, Mohaghegh Ardabili University, P.O. Box. 56199-11367, Ardabil, Iran. Email: d.manzoori@uma.ac.ir
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Abstract

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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.

Keywords

Stars: Binaries eclipsingStars: individualSW Cyg
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 24 , Issue 2 , 2007 , pp. 61 - 68
Copyright
Copyright © Astronomical Society of Australia 2007

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