Gaseous abundances in planetary nebulae: What have we learned in the past five years?

TL;DR

This paper reviews recent progress in determining gaseous abundances in planetary nebulae over the past five years, highlighting advances, remaining challenges, and new questions in the field.

Contribution

It provides a comprehensive overview of recent developments and key findings in the measurement of chemical compositions in planetary nebulae since the last major symposium.

Findings

Improved accuracy in abundance determinations

Identification of unresolved problems in nebular chemistry

Emergence of new questions in planetary nebulae studies

Abstract

Nearly 50 years ago, in the proceedings of the first IAU symposium on planetary nebulae, Lawrence H. Aller and Stanley J. Czyzak said that "the problem of determination of the chemical compositions of planetary and other gaseous nebulae constitutes one of the most exasperating problems in astrophysics". Although the situation has greatly improved over the years, many important problems are still open and new questions have arrived to the field, which still is an active field of study. Here I will review some of the main aspects related to the determination of gaseous abundances in PNe and some relevant results derived in the last five years, since the last IAU symposium on PNe.