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Stanghellini

Astronomy Colloquium - "Chemical evolution of star-forming galaxies through H II region and planetary nebula abundances"

Event Type
Seminar/Symposium
Sponsor
Department of Astronomy
Location
https://go.illinois.edu/AstronomyColloquiumVirtualLink
Virtual
wifi event
Date
Oct 12, 2021   3:45 pm  
Speaker
Dr. Letizia Stanghellini, NOIRLab
Contact
Rebecca Bare
E-Mail
rsbare@illinois.edu
Phone
217-265-8226
Views
18
Originating Calendar
Astronomy Colloquium Speaker Calendar

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.

 

https://go.illinois.edu/AstronomyColloquiumVirtualLink

Topic: Astronomy Department Colloquium
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