Unlocking the mystery of strontium synthesis in the early Galaxy through analysis of barium isotopes in very metal-poor stars

Open Access

Fig. 3

Departure coefficients of the ground state of Ba II (6s) and the upper levels of the resonance transitions in a model atmosphere of a VMP giant. The vertical dashes indicate the line core formation depths of the resonance lines of different strength: 130 mÅ and 60 mÅ at logτ₅₀₀₀ = −2.1 and −1.2, respectively.

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