ULLYSES - new horizons in massive star spectroscopy

The aim of the workshop is to strongly advance our understanding of massive stars in low-metallicity galaxies. This will be achieved by the analysis of spectra of large samples of OB stars obtained by the HST ULLYSES and ESO VLT X-Shooting ULLYSES programs.

Workshop Description: Stars at least 10 times more massive than our sun are the major cosmic engines. Their UV radiation and strong stellar winds regulate the ecology in the early Universe and in today's star forming galaxies. Our knowledge about massive stars chiefly steams from the analyses of their spectra. Currently, two large observing campaigns deliver the UV, optical, and IR spectroscopy of large samples of hot massive stars in the Large- and Small Magellanic Cloud galaxies. These spectra should be analyzed by modern stellar atmosphere codes to obtain realistic stellar and wind parameters and, on this basis, develop a new understanding of the cosmic role of massive stars. The Lorentz Workshop participants will discuss and develop the best strategy to conduct the spectroscopic analysis of these large data-sets. During the Workshop, we will refine the spectroscopic analysis techniques and discuss the new results brought by the HST and ESO observatories. The results of the workshop will pave new roads in the uncharted terrain of low-metallicity star-forming galaxies.