Open Access
Fig. 3.
Composite spectrum (black line) made of one low-luminosity RGB (red line) and one turn-off (blue) star of the Y = 0.248 isochrone. The HRD in the insert shows the position of the two stars (filled triangles) along the Y = 0.248 isochrone. The dotted lines show the HST filters throughputs (F275W, F336W, F438W, and F814W).
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