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Binary Companions of Evolved Stars in APOGEE DR14: Orbital Circularization

  • Authors: Adrian M. Price-Whelan, and Jeremy Goodman

2018 The Astrophysical Journal 867 5.

  • Provider: AAS Journals

Caption: Figure 2.

Orbital period and eccentricity for all of the systems considered in this work. Each panel shows systems in the specified bin of primary surface gravity, log g. Vertical gray lines show periods of 10 days and 100 days; binaries with subgiant members (top left) show transition periods close to 10 days, whereas binaries with red giant branch (RGB) members (bottom right) show transition periods close to 100 days. The vertical shaded (blue) region shows the range of predicted transition periods for each bin in log g assuming M1 = 1.36 M and M2 = 0.5 M for all systems (the median values). Intermediate bins show steadily increasing transition periods with decreasing log g.

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