The first photometric investigations of the G-type shallow contact binary IO Cnc
The first photometric investigations of the G-type shallow contact binary IO Cnc
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DOI：
10.1088/1674-4527/21/2/41
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发表时间：
2021-03
影响因子：
1.8
通讯作者：
Wen-Ping 文萍 Liao 廖;L. Li 李;X. Zhou 周;Qi-Shan 琪善 Wang 王
中科院分区：
文献类型：
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作者：
Wen-Ping 文萍 Liao 廖;L. Li 李;X. Zhou 周;Qi-Shan 琪善 Wang 王
IO Cnc是一个新的G型（G 0）W UMa型食双星系统。我们的第一个测光解表明IO Cnc是一个新的W型浅接触双星，填充因子f = 16.1%，低质量比q = 3.12（或1/q = 0.32）。在轨道周期的研究中，发现了一个周期变化和一个向下的抛物线变化，其速率为（−1.28 ± 0.43）× 10−7 d yr−1。通过一颗红矮星星星的光走时效应分析了其周期变化，得到了短于4.88 ± Au的轨道半长轴。最后，我们收集了50颗G型浅接触双星（f ≤ 20%）的物理参数，发现大部分的G型浅接触双星都经历着长期的周期性轨道周期变化，尤其是更多的系统表现出长期的减小。长期的轨道周期减小表明IO Cnc正处于从质量较大的组分向质量较小的组分的质量转移中。随着轨道周期的长期减小，该浅接触双星将演化为深接触双星。
IO Cnc was classified to be a new G-type (G0) W UMa-type eclipsing binary system. Our first multicolor photometric solutions show that IO Cnc is a new W-subtype shallow contact binary with a fill-out factor of f = 16.1% and a low mass ratio of q = 3.12 (or 1/q = 0.32). During orbital period investigations, a cyclic variation and a downward parabolic variation with a rate of (−1.28 ± 0.43) × 10−7 d yr−1 was discovered in the observed–calculated (O − C) curve. The cyclic variation was analyzed by the light travel time effect (LTTE) via a potential red dwarf companion star, an orbital semi-major axis shorter than 4.88 ± 0.82 AU was obtained. Finally, we collect physical parameters of a sample of 50 G-type shallow contact binaries (f ≤ 20%), it is suggested that most of the G-type shallow contact binaries are undergoing a long-term and periodic orbital period changes, especially more systems show long-term decreases. The long-term orbital period decrease indicates that IO Cnc is in a mass transferring from the more massive component to the less massive one. With the long-term decrease of the orbital period, this shallow contact binary will evolve into a deeper contact one.