Fig. 9

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Response of the line Hu14 to the mass-loss rate. Top panel: As the mass-loss increases, the line changes from an absorption profile to a single-peaked emission. The mass-loss interval goes from 1.5 × 10−7 M⊙ yr−1 to 4 × 10−7 M⊙ yr−1, in a step of 0.5 × 10−7 M⊙ yr−1. The maximum intensity of the single-peaked emission is achieved when Ṁ = 3.5 × 10−7 M⊙ yr−1 (solid blue line), and then the intensity decreases (solid green line). Bottom panel: Synthetic double-peaked-profiles were obtained from 4.5 × 10−7 M⊙ yr−1 to 7 × 10−7 M⊙ yr−1. The behaviour is non-monotonic. Then, as the mass loss increases, the profile turns to a P Cygni one (for Ṁ > 7.5 × 10−7 M⊙ yr−1).
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