HR diagram. The positions of our program Cepheid (black circle) and other lithium Cepheids described in the literature are indicated (V371 Per, blue; V1033 Cyg, green; ASAS 131714-6605.0, red; V363 Cas, cyan; ASAS 075842-2536.1, yellow; OGLE GD-CEP-0516, magenta circles; and two nonvariable supergiants, open circles). We plot the evolutionary tracks from Ekström et al. (2012) for 3–12 solar masses with and without rotation. The solid and dashed lines denote the blue and red boundaries of the instability strip for the usual classic Cepheids and so-called s-Cepheids (first-overtone Cepheids have sinusoidal light curves), respectively.