The Brightest Stars in the Universe as Extragalactic Probes of Cosmic Abundances and Distances

Prof. Rolf-Peter Kudritzki
Tuesday, May 8, 2018 - 4:00pm
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
- multi-object spectroscopy of individual blue and red supergiant stars, the brightest  
  stars in the universe at visual and NIR wavelengths,
- NIR spectroscopy of super star clusters,
- optical spectroscopy of the integrated light of stellar populations in the disks of star 
  forming galaxies,
- the flux-weighted gravity luminosity relationship for distance determinations
and present results accumulated in the last two years. I will then discuss the scientific perspectives and potential of these methods for the use of ELTs.