W UMa双星FP、FV-CVn和V354 UMa的光度学研究和轨道周期分析
Photometric investigation and orbital period analyses of the W UMa binaries FP Lyn, FV CVn and V354 UMa
摘要：
给出了FP Lyn、FV CVn和V354 UMa的新光变曲线和光度解。发现这三个系统都是W型浅接触双星。此外，很明显，FP Lyn和V354 UMa的光变曲线是不对称的。因此，在主星FP Lyn上增加了一个热点，而在副星V354 UMa上增加了一个暗点。与此同时，我们在FP Lyn的光度解决方案中添加了第三盏灯，以获得最终结果。对于FP Lyn，获得的质量比和填充因子为$q=1.153$和$f=13.4\%$，对于FV CVn，获得的质量比和填充因子为$q=1.075$和$f=4.6\%$，对于V354 UMa，获得的质量比和填充因子为$q=3.623$和$f=10.7\%$。对这三个系统轨道周期的研究表明，它们的轨道周期是变化的。发现FP Lyn和V 354 Uma分别存在着长期增长的组分，其增长率分别为$dp/dt=4.19\times10^{-7}$ d yr $^{-1}$和$dp/dt=7.70\times10^{-7}$ d yr $^{-1}$，这可能是由质量较小的组分向质量较大的组分的守恒质量转移引起的。此外，还发现了FV CVn的一些可变成分，即频率为$dp/dt=-1.13\times10^{-6}$ d yr $^{-1}$，伴随着振幅和周期分别为0.0069天和10.65年的周期振荡。长期下降的最可能的解释是角动量损失。而附加分量的存在是对周期性变化的最合理的解释。
英文摘要：
New light curves and photometric solutions of FP Lyn, FV CVn and V354 UMa are presented. It is found that these three systems are W-subtype shallow contact binaries. In addition, it is obvious that the light curves of FP Lyn and V354 UMa are asymmetric. Therefore, a hot spot was added on the primary star of FP Lyn and a dark spot was added on the secondary star of V354 UMa. At the same time, we added a third light to the photometric solution of FP Lyn for the final result. The obtained mass ratios and fill-out factors are $q=1.153$ and $f=13.4\%$ for FP Lyn, $q=1.075$ and $f=4.6\%$ for FV CVn, $q=3.623$ and $f=10.7\%$ for V354 UMa. The investigations of orbital period of these three systems indicate that the periods are variable. FP Lyn and V354 UMa were discovered existing the secular increase component with a rate of $dp/dt=4.19\times10^{-7}$ d yr$^{-1}$ and $dp/dt=7.70\times10^{-7}$ d yr$^{-1}$ respectively, which are feasibly caused by the conservative mass transfer from the less massive component to the more massive component. In addition, some variable components were discovered for FV CVn, which is a rate of $dp/dt=-1.13\times10^{-6}$ d yr$^{-1}$ accompanied by a cyclic oscillation with amplitude and period of 0.0069 days and 10.65 yr. The most likely explanation for the long-term decrease is angular momentum loss. And the existence of an additional component is the most plausible explanation for the periodic variation.
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