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Undetected Binary Stars Cause an Observed Mass-dependent Age Gradient in Upper Scorpius

  • Authors: Kendall Sullivan and Adam L. Kraus

2021 The Astrophysical Journal 912 137.

  • Provider: AAS Journals

Caption: Figure 8.

Result summary figures for a 1200-system subsample of the inexact-distance population. Left: The same as the bottom left panel of Figure 7, but for the same systems analyzed with inexact distances. The distance uncertainty introduces more scatter into the HR diagram across all masses. Right: The same as the bottom right panel of Figure 7, but for an analysis with inexact distances. The added scatter from the distance uncertainty increases the spread in recovered ages for both single and binary stars, blending the two populations together, but the binaries still appear younger than the single stars. We measured an average age residual of 3.49 Myr with an rms of 5.13 Myr for the binary stars, an age residual of −0.50 Myr with an rms of 4.88 Myr for the single stars with Teff < 4800 K, and a residual of −0.69 Myr with an rms of 5.10 Myr for the single stars with Teff ≥ 4800 K.

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