A precontact binary and a shallow contact binary are in the same field
A precontact binary and a shallow contact binary are in the same field
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预接触双星和浅接触双星处于同一区域
DOI：
10.1093/pasj/psw023
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发表时间：
2016-06
影响因子：
2.3
通讯作者：
Liu, Nianping
中科院分区：
文献类型：
--
作者：
Qian, Shengbang;He, Jiajia;Liao, Wenping;Liu, Nianping
研究了V1107Cas和AXCas两颗近距离双星在同一场中的周期变化。它们的周期都显示出长期的下降。进一步分析发现，V1107Cas和AXCas的周期有各自的周期振荡(T_3=6.74±0.24年和T_3=13.8±0.3年)，这可能是由于光时效应而由第三体引起的。我们还获得了V1107CA的完整的VRcIc光曲线，并用2010版的Wilson-Devinney程序进行了分析。测光结果表明，V1107CaS为W型浅接触(15.2%±1.8%)双星，质量比为1.797±0.006。周期变化和光度解表明V1107CaS是一个新形成的接触双星系统。此外，我们还估算了V1107CA的基本参数。分别为：M1=0.39±0.01M，M2=0.70±0.03M，R1=0.52±0.10R，R2=0.68±0.12R，L1=0.178±0.108 L，L2=0.196±0.116 L。然后，基于共面假设，我们推导出V1107CaS可能的第三体质量为M3=0.091±0.019 M，AX CaS为M3=0.325±0.029 M。最后，我们推断了AX Cas的演化阶段，并认为它是一个接触前双星。因此，接触前双星AXCA和浅接触双星V1107CA具有相邻的演化阶段。
The period changes of two close binaries, V1107 Cas and AX Cas, which are in the same field, were investigated. Their periods both show a long-term decrease. After further analysis, we found that the periods have their respective cyclic oscillations (T3 = 6.74 ± 0.24 yr for V1107 Cas and T3 = 13.8 ± 0.3 yr for AX Cas), which are possibly caused by a third body due to the light-time effect. We also obtained the complete VRcIc light curves for V1107 Cas and analyzed them with the 2010 version of the Wilson–Devinney code. The photometric results reveal that V1107 Cas is a W-type shallow contact (15.2%±1.8%) binary, with a mass-ratio of 1.797 ± 0.006. The period variation and photometric solution suggest that V1107 Cas is a newly formed contact binary system. Moreover, we estimated the fundamental parameters for V1107 Cas. They are: M1 = 0.39 ± 0.01 M , M2 = 0.70 ± 0.03 M , R1 = 0.52 ± 0.10 R , R2 = 0.68 ± 0.12 R , L1 = 0.178 ± 0.108 L , and L2 = 0.196 ± 0.116 L . Then, based on the coplane assumption, we deduced the masses of possible third bodies to be M3 = 0.091 ± 0.019 M for V1107 Cas and M3 = 0.325 ± 0.029 M for AX Cas. Finally, we inferred the evolutional stage of AX Cas, and believe that it is a precontact binary. Thus, the precontact binary AX Cas and the shallow contact binary V1107 Cas have adjoining evolutional stages.