Symmetric vs. asymmetric planetary nebulae: morphology and chemical abundances

TL;DR

This study examines the relationship between morphology and chemical composition in galactic planetary nebulae, highlighting differences between symmetric and asymmetric types and comparing findings across different galactic environments.

Contribution

It introduces a comprehensive analysis of chemical abundances and morphology in planetary nebulae using a new classification system, enhancing understanding of their evolutionary differences.

Findings

Symmetric nebulae tend to have different chemical signatures than asymmetric ones.

Correlations between specific elements and nebula morphology are identified.

Comparative analysis with Magellanic Clouds data reveals environmental influences.

Abstract

We analyse a large sample of galactic planetary nebulae based on their chemical composition and morphology. A recent morphological classification system is adopted, and several elements are considered, namely He, N, O, S, Ar, Ne, and C in order to investigate the correlations involving these elements and the different PN types. Special emphasis is given to the differences between symmetric (round or elliptical) nebulae and those that present some degree of asymmetry (bipolars or bipolar core objects). The results are compared with previous findings both for PN in the Galaxy and in the Magellanic Clouds.