5. SUMMARY OF SURVEYS FOR EXTRAGALACTIC PNe

At the time of writing, approximately 5000 PNe have been identified in more than 40 external galaxies. These observations are summarized in Table 2. The galaxy types were taken from the RSA (Sandage & Tammann 1980, 1987) when available. Galaxy distances in bold type are based on the PNLF. Column 4 gives the number of PNe identified in each galaxy and column 5 gives the references for the identifications. The sixth column list references for those galaxies that have chemical abundance determinations for their PNe. Space did not permit inclusion of the large number of chemical abundance studies of PNe in the LMC and SMC. References for galaxies with PNe radial velocities and dynamical studies are listed in the last column of Table 2.