Evolution of stellar energy output of four AGB models with remnant masses of 0.565, 0.595, 0.625, and 0.696 M_⊙ (already used in SSW and Ruiz et al. 2013) versus their effective temperatures. The ‘reference’ track of Fig. 1, 0.595 M_⊙, is highlighted by a thick red line. The positions of the objects from Table 3 are labelled with the object’s number within either a circle (O-type central star) or a hexagon ([WR]-type central star). Top: stellar bolometric photon luminosity; NGC 7026 (no. 12) falls outside the plotted luminosity range. Bottom: wind luminosity of the same AGB-remnants; NGC 7026 is now included. Solid tracks refer to the ‘standard’ mass-loss model Ṁ_PPKMH (Pauldrach et al. 1988, see Sect. 2). The dashed track corresponds to a 0.595 M_⊙ model with the wind power increased by a factor of 50 (see text).