Extended Data Figure 1 : Comparison simulation versus optical data.

From: Rapidly rotating second-generation progenitors for the ‘blue hook’ stars of ω Centauri

Extended Data Figure 1

The observed data10 are shown as grey dots. The diagonal line suggests the division between blue hook and cooler extreme horizontal branch stars. a, Tracks shown are for M = 0.466M, Y = 0.37 and evolutionary Mc = 0.463M (black solid line), plus the corresponding track in which Mc is increased by 0.04M (magenta solid line). The zero-age horizontal branch for Y = 0.37 (dashed black) and the 0.471M track (dotted black) are also shown. b, Result of the coupled dynamical–evolutionary simulation (detailed explanation in Fig. 1).