AG meeting 2017

Splinter Meeting HotStars

Hot Stars and Binary Evolution

Time: Thursday September 21, 14:00-16:30 and 17:00-19:00

Organizers: Andreas Sander, Kerstin Weis, Veronika Schaffenroth

Hot stars dominate the galactic budget of ionizing photons and profoundly impact their environments. While typically associated with massive stars, e.g., OB-type stars, Wolf-Rayet stars, Red Supergiants, Luminous Blue Variables, even low-mass stars may develop high temperatures as they evolve beyond core-hydrogen burning to become Hot Subdwarfs, Central Stars of Planetary Nebula, and Hot White Dwarfs.

As if the physics of mass-loss by wind or erruptions, rotation, and magnetic fields weren't complicated enough - we are now forced to acknowledge the fact that the majority of stars are found in binary systems and a significant fraction of them will likely interact with companions during their lifetimes. Those interactions can be stable and steady mass transfer, but also rather short-lived and violent events like common envelope ejection or mergers. Also single stars can be the result of such interactions.

There is a multitude of evolutionary scenarios existing for binaries. But are they really successful in explaining our observations?

In this splinter, we want to discuss our current understanding of the evolution of hot stars in all phases of stellar evolution, focusing on the impact of binarity on their evolution.