A relation between the radial velocity dispersion of young clusters and their age - Evidence for hardening as the formation scenario of massive close binaries

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Fig. 1.

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Radial-velocity dispersion (σ_1D) versus age of the clusters. The purple data points show the data from Sana et al. (2012), the magenta points show Wd2 and R136 (Zeidler et al. 2018; Hénault-Brunet et al. 2012), and the green data points show the clusters studied in Ramírez-Tannus et al. (2020) and Sana et al. (2017). The solid black line represents the linear fit to the data and the gray area shows the 1-σ errors on the fit.

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