W型UMa型双星GSC 0763-0572的CCD测光研究
CCD Photometric Investigation of A W UMa-Type Binary GSC 0763-0572
摘要：
用修正的轨道周期检验了A型W UMa双星GSC 0763-0572的光度解。发现过接触度为$f$ = 40.66%，具有低质量比$q$ = 0.2554。结果表明轨道周期明显增加，相对周期变化为$ΔP\slash P = +5.69\times10^{-7} $ d yr $^{-1}$。这表明GSC 0763-0572正在经历从次要组分到主要组分的质量转移过程，对于保守的质量转移模型，相对质量变化率为$Δ$ $m_1$ $\slash$ $m$ $=+5.18\times10^{-8}$ yr $^{-1}$。我们发现GSC 0763-0572可能会转变成一个快速旋转的恒星，如果总的自旋角动量增加，直到它大于三分之一的轨道角动量，而不打破接触配置。
英文摘要：
A photometric solution of an A-type W UMa binary, GSC 0763-0572 is examined with a revised orbital period. The overcontact degree is found to be $f$ = 40.66%, with a low mass ratio of $q$ = 0.2554. The result demonstrates an unambiguous increase in the orbital period with a relative period change of $ΔP\slash P = +5.69\times10^{-7} $d yr$^{-1}$. This indicates that GSC 0763-0572 is undergoing a process of mass transfer from the secondary component to the primary one with a rate of relative mass change of $Δ$$m_1$$\slash$$m$ $=+5.18\times10^{-8}$ yr$^{-1}$, for a conservative model of mass transfer. We find that GSC 0763-0572 might transform into a rapidly rotating star, if total spin angular momentum increases until it is greater than one-third of the orbital angular momentum, without breaking the contact configuration.
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