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Fig. 3.

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Dispersion relations for the two-component stars plus gas system with finite thickness (Eq. (46)) are shown for Qs = 1.5, Qg = 1.3, and for different gas fractions: ϵ = 0.15 (top panel) and ϵ = 0.2 (bottom panel). The thickness of the stellar disc (βs) is varied from 0.1 to 0.3, whereas the thickness of the gas disc (βg) is kept fixed at 0.1 throughout all cases shown here. For comparison, the corresponding dispersion relation for the zero-thickness stars plus gas system is also shown (dashed black line).

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