Schematic profile formation of a blended inverse P Cygni profile. Panel a: the supersonic (≈50 km s−1) descending atmospheric layers produce a radiative emission centered on 0 km s−1 (blue curve).This profile is blended with photospheric redshifted (≈15 km s−1) absorption (orange curve) resulting in an apparently weak blueshifted emission. Panel b: in long-period Cepheids, a component centered on 0 km s−1 is attributed to a CSE (green) and causes the appearance of a double absorption profile.
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