Constraining the helium-to-metal enrichment ratio ΔY/ΔZ from main-sequence binary stars - Theoretical analysis of the accuracy and precision of the age and helium abundance estimates

Open Access

Fig. 2.

Stellar tracks for different masses, [Fe/H], and ΔY/ΔZ. Left: evolutionary tracks for M = 0.85 M_⊙. The solid line corresponds to [Fe/H] = 0.0, and ΔY/ΔZ = 2.0. Dashed lines correspond to [Fe/H] = 0.1 for different values of ΔY/ΔZ. The dotted line marks the radius value at 80% of the evolution in MS. Right: same as in left panel, but for M = 1.00 M_⊙.

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