Image Details
Caption: Figure 9.
Orbital period as a function of the e/i statistic for members or possible members of the Hyades with known astrometric or spectroscopic orbits. The inset zooms in on the inner portion of the diagram (e/i < 25), and shows that most targets with e/i > 2 (marked with a dashed line) tend to have periods under 104 days, with very few exceptions. We may expect, then, that other objects with e/i > 2, which we consider to be binaries even though the orbits are unknown, will also typically have periods under 104 days, and we include them in the calculation of the multiplicity fraction.
© 2026. The Author(s). Published by the American Astronomical Society.