Abstract

Contributed Talk - Splinter JungeAG

Tuesday, 16 September 2025, 14:10

Kinematic Classification of Radial Velocity Variable Hot Subdwarfs

Finn Götze
Universität Potsdam

Hot subdwarf stars are found throughout the disk and halo of our Galaxy and represent a late stage in the evolution of low-mass stars. In the context of my bachelor's thesis I am conducting a kinematic study of hot subdwarf stars of spectral type O and B (sdO/sdB), aimed at understanding the Galactic populations that host radial velocity (RV) variable binaries. Galactic space velocities are calculated using a sample of several hundred sdO/sdB stars with reliable parallaxes, radial velocity and proper motion measurements. Using Monte Carlo statistics each star is then probabilistically assigned to the thin disk, thick disk or halo based on a comparison of its velocities to the empirically determined stellar velocity distribution functions. The binarity rates of these populations are then further analysed based on their RV variability. In my talk, I will provide a brief overview of my work and present some preliminary results.