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Evidence of a Third Body and Photometric Solutions of a High Temperature Marginal Contact Binary CW Aqr

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摘要 Marginal contact binary systems are an important class of binary systems in exploited by astronomers to understand various astrophysical phenomena as they bridge both semi-detached and overcontact stages.We studied the photometric data of CW Aqr using the JCB 1.3 m telescope(JCBT),Kepler,and TESS to understand the period variations and constrain the light curve solutions.We noted that the period of CW Aqr is increasing with a mass transfer rate of m=7.53×10^(-8)M_(⊙)yr^(-1)from the secondary to the primary component.We also ascertained cyclic deviations along with a parabolic trend in the O-C diagram.The residuals displayed a sinusoidal trend which was fitted with an LTTE,indicating the presence of a third body with an orbital period of P_(3)~10 yr and e=0.10.We fitted the JCBT,Kepler,and TESS photometric normalized light curves and noted the mass ratio to be q~0.32 for both contact and semi-detached configurations.We identified a temperature difference between the primary and secondary components of~2500 K.No activity signatures were found in the observed light curves which were also evident from the Hαline studies where the filled-in effect was not seen.Overall our study suggests that CW Aqr is a marginal contact binary with a low mass ratio evolving toward a semi-detached configuration.However,it may merge if the period increases due to ongoing mass transfer accompanied by a lowering in the mass ratio and later oscillate back to the period-decreasing trend due to angular momentum loss over a few cycles of thermal relaxation oscillations followed by instability.
出处 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2023年第5期91-100,共10页 天文和天体物理学研究(英文版)
基金 the Core Research Grant of SERB,India for the financial support。
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