In this review/tutorial we explore planetary nebulae as a stage in the evolution of low-to-
intermediate-mass stars, as major contributors to the mass and chemical enrichment of the …

Analysis of emission lines in gaseous nebulae yields direct measures of physical conditions
and chemical abundances and is the cornerstone of nebular astrophysics. Although the …

We present a tutorial on the determination of the physical conditions and chemical
abundances in gaseous nebulae. We also include a brief review of recent results on the …

Emission and absorption lines from elements heavier than helium (metals) represent one of
our strongest probes of galaxy formation physics across nearly all redshifts accessible to …

We study the asymptotic giant branch (AGB) evolution of stars with masses between 1 M⊙
and8. 5 M⊙. We focus on stars with a solar chemical composition, which allows us to …

We present MUSE deep integral-field unit spectroscopy of three planetary nebulae (PNe)
with high-abundance discrepancy factors (ADF> 20): NGC 6778, M 1–42, and Hf 2–2. We …

It has recently been noted that there seems to be a strong correlation between planetary
nebulae with close binary central stars and highly enhanced recombination line …

For the first time, the sulphur abundance relative to hydrogen (S/H) in the narrow-line
regions of a sample of Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation of the …

In this work, we present a new catalogue of> 40 000 ionised nebulae distributed across the
19 galaxies observed by the PHANGS-MUSE survey. The nebulae have been classified …

To place meaningful constraints on Big Bang Nucleosynthesis models, the primordial helium
abundance determination is crucial. Low-metallicity H ii regions have been used to estimate …