Fig. 12
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3564 BHB candidates in the Kiel diagram, colour-coded by projected rotational velocities. Grey dots show BHB candidates selected by Xiang et al. (2022) using similar selection criteria. Red lines display PARSEC (Bressan et al. 2012) isochrones for horizontal branch stars with metallicities [Fe/H] = −2.5 dex (solid) and −2.0 dex (dashed), corresponding to ages log(t/yr = 8.6, 8.8, and 9.0 (left to right, respectively).
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