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Variability in Proto-planetary Nebulae. VI. Multitelescope Light Curve Studies of Several Medium-bright (<i>V</i> = 13โ15), Carbon-rich Objects
We present ten years of new photometric monitoring of the light variability of five evolved stars with strong mid-infrared emission from surrounding dust. Three are known carbon-rich proto-planetary nebulae (PPNe) with F$-$G spectral types; the nature of the other two was previously unknown. For the three PPNe, we determine or โฆ