Fig. 7
Observed relation between the Hα spectral line widths versus asteroseismic masses of stars. Star clusters from the Gaia-ESO survey are shown with green squares. The very metal-poor stars in the sample, [Fe/H] < − 2, are shown with red symbols. Dashed black lines show the 1σ uncertainty of the fit. The shaded area is the average rms between the data and the fit. See Sect. 3.
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