Splinter Meeting HotStars

Revisiting the nature of (hot) stars, X-ray binaries, and supernova: the main feedback agents in galaxies near and far

Time: Friday September 15, 14:00-15:45 and 16:15-18:00 CEST (UTC+2)

Room: H 2036

Convenor(s): Jakub Klencki [1], Sabela Reyero [2], Daniel Pauli [2]
[1] ESO), [2] Uni Potsdam

Massive and hot stars shape their surroundings via strong ionizing radiation and by the injection of material from powerful stellar winds and supernova explosions. These feedback channels regulate star formation, enrich the interstellar medium with heavy elements and are impacting the galactic structure and composition. However, there are still many unknowns in the evolution of the stars that we observe on the night sky. For instance, we are not able to fully understand how Wolf-Rayet (WR) as well as helium stars, X-ray binaries and the different kinds of supernova explosions are interconnected within the framework of stellar and binary evolution, despite being amongst the strongest sources of stellar feedback. In this splinter session we want to address fundamental questions such as: How many stars are born in binaries and what is their role in the Universe? Are WR and helium stars dominantly produced from binary interactions? How do these interactions alter the amount of ionizing radiation and mechanical energy emitted by the stripped stars? How does this impact the frequency of the different kinds of supernova explosions that we predict? Do all stars explode? What is the evolutionary nature of high-mass X-ray binaries and ultraluminous X-ray sources? What are the main feedback channels of X-ray binaries? What are the masses of stellar black holes and what is the evolutionary connection between the diverse classes of objects that host stellar black holes?
To answer some of these questions, we aim to bring together the observers and theorists of the different communities. We invite contributions on a wide range of topics, including the properties of hot stars, the formation mechanisms of compact objects, the connection between intermediate and final stages of stellar evolution, and the feedback processes that shape galaxies. This session will provide a platform for researchers to present their work, share their insights, and explore new opportunities for future collaborations.


Friday September 15, 14:00-15:45 Revisiting the nature of (hot) stars, X-ray binaries, and supernova (H 2036)

14:10  Andreas Sander:
Massive, hydrogen-deficient stars as sources of strong ionizing flux

14:40  Luis Abalo:
Long-term monitoring study of Vela X-1 in the 2–10 keV energy band

15:05  Susanne Blex:
The rotation of single and binary O-stars in the Milky Way

Friday September 15, 16:15-18:00 Revisiting the nature of (hot) stars, X-ray binaries, and supernova (H 2036)

16:15  H. Todt:
Wind properties of Wolf-Rayet-type central stars of planetary nebulae

16:40  Daniel Pauli:
Do stars in binaries evolve differently at low metallicity?

17:10  Sabela Reyero Serantes:
Analysis of the UV spectrum of Holmberg II X-1

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