Abstract
The Algol type binary system WW Cygni is known to display an intricate orbital period variability phenomenon which consists in the presence of an alternating component superposed on a secular trend.
The alternating component clearly deviates from a strictly periodic pattern. In the present paper we studied WW Cyg using a data set consisting of 309 times of primary minimum, free of outliers, covering a time base of 113.8 yr.
We investigated these timing data using periodicity detection methods relying on both amplitude spectrum and enhanced self-correlation (ESC) methods through Monte Carlo simulations.
The problem of estimation of the statistical significance in the ESC method was further developed. The multiperiodicity of the O−C residuals was investigated via iterative prewhitening using three types of models consisting of polynomial (P) + multiperiodic (MP) terms, P + light travel time effect (LTTE) terms, and P + MP terms + LTTE terms.
The interpretation of the results led us to the following two hypotheses: (i) a quasiperiodic modulation at a time scale of about 46 yr induced by the cyclic magnetic activity occurring in the cool secondary component of WW Cyg, or (ii) the coexistence of a periodic modulation with a period of 50.41 yr related to the presence of an unseen compact stellar object of at least 2.22 M⊙ in the system and a quasiperiodic modulation at a time scale of about 19.7 yr, caused by the mechanism (i).
Authors
A. Pop,
M. Crăciun,
G.R. Mocanu,
C. Vamoș
Keywords
Binaries: eclipsing · Stars: individual: WW Cyg · Methods: data analysis, statistical
Cite this paper as:
A. Pop, M. Crăciun, G.R. Mocanu, C. Vamoș, Evidence for quasiperiodicity in orbital period modulation of WW Cygni, Astrophysics and Space Science 362: 76. (2017)
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