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Fig. 2


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 δṀ0 = 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 RR0 when δṀ0 = 0.9. Two cycles of the periodic variability are shown for clarity of viewing.

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