论文标题
W-Subtype浅触点二进制OWLEO的轨道周期校正和光曲线建模
Orbital period correction and light curve modeling of the W-subtype shallow contact binary OWLeo
论文作者
论文摘要
首次提出了轨道周期和多色光曲线对OW LEO的研究。 OW LEO的轨道时期从$ p = 0.325545 $天到$ P = 0.32554052 $天数，我们的工作中的观察数据来自All-Sky自动化的超新星自动化调查（ASAS-SN），以测试新确定的轨道周期。然后，分阶段的光曲线是按新时期计算的，并且将Wilson-Devinney程序应用于对光曲线进行建模，这表明OW LEO是W-Subtype浅触点二进制二进制系统（$ Q = 3.05 $，$ f = 12.8 \ \ \％\％$）。两个组分星的绝对物理参数估计为$ m_ {1} = 0.31（1）m_ \ odot $，$ m_ {2} = 0.95（3）m_ \ odot $，$ r_ {1} = 0.63（1） = 0.43（1）l_ \ odot $和$ l_ {2} = 1.01（2）l_ \ odot $。进化状态表明，较大的恒星的进化较小，而不是巨大的恒星。 OW LEO具有非常低的金属丰度，这意味着其形成和进化几乎不受任何其他成分的影响。它是由最初脱离的二进制系统通过磁制动而形成的，并通过了很长的时间进行主序列演化。
Orbital period and multi-color light curves' investigation of OW Leo are presented for the first time. The orbital period of OW Leo is corrected from $P = 0.325545$ days to $P = 0.32554052$ days in our work, and the observational data from the All-Sky Automated Survey for SuperNovae (ASAS-SN) are used to test the newly determined orbital period. Then, the phased light curves are calculated with the new period and the Wilson-Devinney program is applied to model the light curves, which reveal that OW Leo is a W-subtype shallow contact binary system ($q = 3.05$, $f = 12.8\,\%$). The absolute physical parameters of the two component stars are estimated to be $M_{1} = 0.31(1)M_\odot$, $M_{2} = 0.95(3)M_\odot$, $R_{1} = 0.63(1)R_\odot$, $R_{2} = 1.04(1)R_\odot$, $L_{1} = 0.43(1)L_\odot$ and $L_{2} = 1.01(2)L_\odot$. The evolutionary status show that the more massive star is less evolved than the less massive star. OW Leo has very low metal abundance, which means its formation and evolution are hardly influenced by any additional component. It is formed from an initially detached binary systems through nuclear evolution and angular momentum loss via magnetic braking, and have passed a very long time of main sequence evolution.
