Table 5

Masses M_m and M_V interpolated from double He-WD mergers (Fig. 26) and evolutionary tracks of VLTP post-AGB stars (Fig. 24), respectively, luminosities L, radii R, Galactic coordinates l and b, distances d, and heights above the Galactic plane z of the O(He) stars, as well as the kinematical ages t_PN of the two PNe.

			HS	HS
	K 1−27	LoTr 4	1522+6615	2209+8829
Mm/M⊙
MV/M⊙
log L/L⊙	3.2 ± 0.4	3.6 ± 0.3	3.7 ± 0.2	3.2 ± 0.2
R/R⊙
l / °	286.877	291.434	102.481	117.849
b/°	−29.577	+19.258	+44.561	+21.545
d/kpc				.
z/kpc
tPN/yr