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Rome Joint Astrophysics Colloquia

The Brightest Stars in the Universe as Extragalactic

Probes of Cosmic Abundances and Distances

The determination of chemical composition and distance

is crucial for investigating the formation and evolution of

star forming galaxies. Stellar absorption line studies based

on quantitative spectroscopy provide an attractive

alternative to the standard techniques using the strong

emission lines of HII regions for chemical composition or

stellar photometric methods for distances. I will introduce

a number of newly developed methods: a) multi-object

spectroscopy of individual blue and red supergiant stars,

the brightest stars in the universe at visual and NIR

wavelengths; b) NIR spectroscopy of super star clusters; c)

optical spectroscopy of the integrated light of stellar

populations in the disks of star forming galaxies; d) the

flux-weighted gravity luminosity relationship for distance

determinations and present results accumulated over

recent years. I will then discuss the scientific perspectives

and potential of these methods for the use of future

Extremely Large Telescopes.

Rolf-Peter Kudritzki

University Observatory Munich

IfA, University of Hawaii

Wednesday 25 May 2022 time 16:30 CEST

Join from MS Teams App: https://rebrand.ly/JAC-Kudritzki

Contacts: francesco.tombesi@roma2.infn.it

marina.migliaccio@roma2.infn.it