SMuK 2023 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 9: Poster
EP 9.9: Poster
Wednesday, March 22, 2023, 17:30–19:00, HSZ OG1
Quantitative spectroscopy of B-type supergiants — •David Wessmayer1, Norbert Przybilla1, and Keith Butler2 — 1Institut für Astro- und Teilchenphysik, Universität Innsbruck, Technikerstr. 25/8, 6020 Innsbruck, Austria — 2LMU München, Universitätssternwarte, Scheinerstr. 1, 81679 München, Germany
B-type supergiants are a resourceful tool in adressing various astrophysical questions concerning stellar atmospheres, stellar and galactic evolution and the cosmic distance scale. To facilitate a comprehensive analysis of these objects we assess the applicability of a hybrid non-LTE approach, in which line-blanketed model atmospheres computed under the assumptions of local thermodynamic equilibrium (LTE) are combined with non-LTE line-formation calculations. High-resolution Echelle spectra – constituting an observational sample of 14 Galactic B-type supergiants with masses below about 30 M⊙ – serve as the basis of this investigation. The results of the analysis, including atmospheric and fundamental stellar parameters, multi-species abundances and derived spectroscopic distances, are probed via multiple checks of consistency. Finally, we also test the employed methodology for analyses of intermediate-resolution spectra of extragalactic B-type supergiants.