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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: [email protected]
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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

References

Applegate, J. H., 1989, ApJ, 337, 865 Google Scholar
Applegate, J. H., 1992, ApJ, 385, 621 Google Scholar
Applegate, J. H. & Patterson, J., 1987, ApJ, 322, L99 CrossRefGoogle Scholar
Berrington, R. C. & Hall, D. S., 1994, AJ, 107, 1868 CrossRefGoogle Scholar
Blazko, S., 1924, ANZi, 7, 35 Google Scholar
Bondi, H. & Hoyle, F., 1944, MNRAS, 104, 273 CrossRefGoogle Scholar
Chaubey, U. S., 1980, AP&SS, 103, 55 Google Scholar
Dugan, R. S. & Wright, F. W., 1939, Contribution from the Prinstone University ObservatoryGoogle Scholar
Frieboes-Conde, H. & Herczeg, T., 1973, A&AS, 12, 1 Google Scholar
Hall, D. S., 1989, SSRV, 50, 219 Google Scholar
Hall, D. S., 1991, ApJ, 380, L85 Google Scholar
Hall, D. S. & Garrison, L. M. Jr., 1972, PASP, 84, 552 Google Scholar
Hall, D. S. & Kreiner, J., 1980, AcA, 30, 387 Google Scholar
Hack, M., 1984, IUE Proposal, 1944Google Scholar
Huang, S.-S., 1963, ApJ, 138, 417 Google Scholar
Irwin, J. B., 1959, AJ, 64, 149 Google Scholar
Kalimeris, A., Livaniou, H. R. & Rovithis, P., 1994, A&A, 282, 775 Google Scholar
Lanza, A. F., Rodono, M. & Ronse, R., 1998, MNRAS, 296, 893 Google Scholar
Manzoori, D., Jassur, D. M. Z. & Kermani, M. H., 2006, Ap&SS, 302, 145 Google Scholar
McNamara, D. H. & Feltz, K. A. Jr., 1976, PASP, 88, 688 Google Scholar
Olson, E. C., 1981, ApJ, 250, 704 Google Scholar
Olson, E. C., 1985, PASP, 97, 731 Google Scholar
Olson, E. C., 1987, AJ, 94, 1043 CrossRefGoogle Scholar
Olson, E. C. & Etzel, P. B., 1993, AJ, 106, 342 CrossRefGoogle Scholar
Parthasarathy, M., Lambert, D. L. & Tomkin, J., 1983, MNRAS, 203, 1063 Google Scholar
Qian, S. B., Zhu, L. Y., & Boonrucksar, S., 2002, A&A, 396, 609 Google Scholar
Richards, M. T., 1992, ApJ, 387, 329 Google Scholar
Richards, M. T., 1993, ApJS, 86, 255 Google Scholar
Richards, M. T. & Albright, G. E., 1993, ApJS, 88, 199 Google Scholar
Simon, V., 1997, A&A, 327, 1087 Google Scholar
Struve, O., 1946, ApJ, 104, 253 Google Scholar
Todoran, C. N. & Agerer, Z., 1994, AN, 315, 349 Google Scholar
Walter, K., 1971, A&A, 13, 249 Google Scholar
Wendell, O. C., 1909, AnHar, 69, 1 Google Scholar