Top panel: V-band amplitude as a function of effective temperature for the Kiss et al. (2007) sample of post-AGB variables, supplemented with the location of DF Cygni. Open circles: single periodic stars; triangles: multiperiodic/semi-regular stars; squares: variability due to orbital motion. The bar in the upper left corner shows the typical cycle-to-cycle amplitude variation in the pulsating stars. Bottom panel: the empirical HRD of the pulsating sample of Kiss et al. (2007) and the location of DF Cygni. The dashed lines show the edges of the classical instability strip, taken from Christensen-Dalsgaard (2003). The error bars in the lower right corner represent ±3% error in effective temperature (about 200 K in the range shown) and the ±0.35 mag standard deviation of the LMC P–L relation.
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