Göttingen 2025 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 10: Poster Session

EP 10.7: Poster

Donnerstag, 3. April 2025, 11:00–12:30, ZHG Foyer 1. OG

Revealing the pulsation-induced mass loss of blue supergiants and its interplay with the interstellar medium — Michaela Kraus, Julieta Sánchez Arias, Peter Németh, Michalis Kourniotis, •Olga Maryeva, Dieter Nickeler, Suryani Guha, and Kuljeet Saddal — Astronomical Institute of the Czech Academy of Sciences, Ondrejov, Czech Republic

Massive stars play an important role in many astrophysical processes: from the formation of heavy elements in the Universe to a significant influence on the evolution of their host galaxies and star formation. One of the key parameters required to accurately model these processes, alongside luminosity, is the mass-loss rate. In the talk we will present a new ambitious project devoted to the determination of the mass loss rate for blue supergiants (BSGs) -- evolutionary phase through which all massive stars pass. The goal of the project is to quantify the total amount of mass loss of BSGs from their winds and pulsations as improved input to stellar evolution calculations, and to gain insight into the mutual interaction between stellar pulsations, winds and their impact on shaping the local interstellar medium. In order to achieve our goal, we will combine calculation of the evolution and internal structure of massive stars (MESA code); computation of pulsations (GYRE code); stellar atmosphere and wind modeling (CMFGEN) -- with collected time-series of spectroscopic and photometric observations. Also, we will use the obtained wind parameters in 2D and 3D magneto-hydrodynamics calculations to study its interaction with the interstellar medium.

Keywords: massive stars; blue supergiants; stellar pulsations; stellar winds; mass loss