Projected rotational velocity of solar twins as a function of their age. The Sun is represented by the symbol ⊙. Left panel: all stars of our sample; the orange triangles are spectroscopic binaries, blue circles are the selected sample and the blue dots are the remaining nonspectroscopic binaries. Right panel: the rotational braking law; the purple continuous curve is our relation inferred from fitting the selected sample (blue circles) of solar twins with the form vsini = vf + mt− b, where t is the stellar age, and the fit parameters are vf = 1.224 ± 0.447, m = 1.932 ± 0.431, and b = 0.622 ± 0.354, with vf and b highly and positively correlated. The light gray region is composed of 300 curves that are created with parameters drawn from a multivariate Gaussian distribution defined by the mean values of the fit parameters and their covariance matrix. Skumanich’s law (red × symbols, calibrated for km s-1) and the rotational braking curves proposed by do Nascimento et al. (2014, black dashed curve, smoothed) and Pace & Pasquini (2004, black dot-dashed curve) are plotted for comparison.
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