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Northern Galactic Planetary nebulae (PNs) are studied to disclose possiblecorrelations between the morphology of the nebulae and the evolution of thecentral stars (CSs). To this end, we have built the best database available todate, accounting for homogeneity and completeness. We use updated statisticaldistances, an updated morphological classification scheme, and we calculateZanstra temperatures for a large sample of PNs. With our study we confirm thatround, elliptical, and bipolar PNs have different spatial distributions withinthe Galaxy, with average absolute distances to the Galactic plane 0.73, 0.38,and 0.21 kpc respectively. We also find evidence that the distributions of thecentral star's masses are different across these morphological groups, althoughwe do not find that CSs hosted by bipolar PNs are hotter, on average, than CSswithin round and elliptical PNs. Our results are in broad agreement with theprevious analyses, indicating that round, elliptical, and bipolar PNs evolvefrom progenitors in different mass ranges, and may belong to different stellarpopulations, as also indicated by the helium and nitrogen abundances of PNs ofdifferent morphology.Comment: 31 pages, 6 figures, 4 tables. Accepted for publication in Ap

The Correlations between Planetary Nebula Morphology and Central Star Evolution: Analysis of the Northern Galactic Sample