This article has an erratum: [https://doi.org/10.1051/0004-6361/201834752e]
Variability in the forbidden line luminosity (upper), intercombination line luminosity (middle), and the line ratio (lower). Here, L0 is a constant, and R0 is the line ratio in the absence of UV pumping. These are plotted against time relative to the period P for variability in the mass-loss rate. The different curves indicate δṀ∕Ṁ0 = 0.1 (dash-dot), 0.3 (long dash), 0.5 (short dash), 0.7 (dotted), and 0.9 (solid). In the lower panel, the horizontal line in magenta indicates δṀ = 0.0. The two vertical green lines represent the minimum and maximum values of R∕R0 when δṀ∕Ṁ0 = 0.9. Two cycles of the periodic variability are shown for clarity of viewing.
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