Séminaire/Seminar Galaxies |
| « Chemical evolution of star-forming galaxies through HII region and planetary nebula abundances » |
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Letizia Stanghellini |
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The metallicity of galaxies carries the signature of their chemical evolution through cosmic time, changing according to star formation history, gas accretion during the early evolutionary stages, and subsequent gas inflows and outflows. To make progress is essential to constrain the cosmology-based models of chemical evolution with observables such as galactic metallicity gradients.
Planetary nebulae (PNe) and HII regions are ideally suited to characterize the gas-phase metallicity in the Milky Way and other star-forming galaxies. The abundance of elements that do not vary during their progenitor’s evolution pinpoints the medium metallicity at the time of progenitor formation. The different progenitor’s stellar mass of PNe and HII regions probe different epochs in galaxy history that allow the study of gradients and their time evolution. I will discuss metallicity gradient and their evolution in star-forming galaxies as constrained by emission-line probes. Topics will include (1) Dating the PN progenitors through elemental abundance analysis; (2) Improving the distance scale of Galactic PNe; (3) Comparing direct abundances of PNe and HII regions in nearby spiral galaxies; (4) Reviewing future facilities that will dramatically improve these studies and extend them to nearby galaxy clusters and distant galaxies. |
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jeudi 25 mai 2023 - 11:30 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |