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Rome Joint Astrophysics Colloquia

Reading Physics from Stellar Spectra

The Milky Way is host to hundreds of billions of stars. Of them,

about 10 million, less than 0.01%, have so far been mapped by

large-scale spectroscopic surveys. We will soon see major

progress in the quantity, quality, and depth of data with

next-generation astronomical facilities. In this seminar, I will

focus on the frontiers in diagnostic stellar spectroscopy. First, I

will summarize the key principles behind physical models that

allow us to extract physical parameters of stars from their

observed spectra. 3D non-equilibrium models of stellar

atmospheres and spectra are poised to become workhorses of

astronomy in the next decade. Second, I will show how we

overcome another challenge: the innovative combination of

the models and complex noisy data. Third, I will demonstrate

how new data and new models drive progress in areas that

rely on stellar parameters and chemical composition of stars.

These include studies of exoplanets, gravitational wave

sources, and Galaxy formation. I will close with a personal

view of perspectives opening with large facilities of the next

decade, such as SDSS-V, 4MOST, and ELT.

Maria Bergemann

Max Planck Institute for Astronomy

Tuesday 21 May 2024 time 14:30 CEST

Join in person at Aula Magna “Gismondi” Tor Vergata University (Via della

Ricerca Scientifica 1) or online with the MS Teams App

https://rebrand.ly/JAC-Bergemann

Contacts: francesco.tombesi@roma2.infn.it

marina.migliaccio@roma2.infn.it

luca.giovannelli@roma2.infn.it