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Table 2.

Summary of the spectral types of CSPNe compiled in our catalogue, grouped by their atmospheric hydrogen abundance.

H-rich H-poor

SpT Sample SpT Sample SpT Sample
O3-B1 133 cont. 22 [WC 4–12] 68
Of 31 hybrid 3 [WO 1–4] 37
Of-WR(H) 3 SySt 11 [WN] 8
B2-M9 40 Blue 50 [WR] 10
DA, WD 14 EL 8 PG 1159 17
DAO 28 wels 77 [WC]-PG 1159 2
sdO 12 O(He) 5
hgO(H) 12 O(C) 1
B[e] 6 DO 4
H-rich 11 H-poor 1

Total 290 Total 171 Total 153

Notes. We include confirmed and probable spectral types. Here, we have discarded 6 objects without any specific spectral type. The O3-B1 group include objects classified as O(H), O and OB. [WR] group include the two objects classified as [WN/C] and [WO]-[WC 8].

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