Figure 2 from Three Close Binaries in Different Evolutionary Stages in the Old Open Cluster NGC 188

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Three Close Binaries in Different Evolutionary Stages in the Old Open Cluster NGC 188

Authors: L. Y. Zhu, S. B. Qian, B. Soonthornthum, L. Liu, J. J. He, N. P. Liu, E. G. Zhao, J. Zhang, and J. J. Wang

Zhu et al. 2014 The Astronomical Journal 147 42.

Provider: AAS Journals

Caption: Figure 2.

O − C curves of EP Cep (left), ES Cep Per (middle), and V369 Cep (right). The solid lines represent the quadratic fit curves. The dashed line refers to the linear fit. Dots in the upper panels represent CCD observations. All residuals are shown in the lower panels with dots (quadratic fit) and open circles (linear fit).

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