Summary of the spectral types of CSPNe compiled in our catalogue, grouped by their atmospheric hydrogen abundance.
|DA, WD||14||EL||8||PG 1159||17|
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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