Matti Dorsch – Institut für Physik und Astronomie, Universität Potsdam, Alemania
Miércoles 18 de octubre. Salón Meridiano. De 12:30 a 13:30 hs.
Título: Connecting the dots: stellar parameters, binarity, and kinematics
Resumen: Hot subdwarf stars are low-mass stars of spectral type O and B (sdO/B)
that have very thin or no hydrogen envelopes. Almost all of these core helium burning stars seem to have formed from binary interaction: common envelope evolution, stable Roche lobe overflow, or stellar mergers.
Detailed analysis of single stars are one important way to constrain these formation processes. However, such analyses can not fully constrain important quantities such as the relative importance of specific formation channels or the parameter ranges that can be
produced. This information can only be obtained from statistically significant samples of stars. I will talk about insights gained from the spectral energy distributions and Galactic kinematics of the sample spectroscopically identified hot subdwarf stars. This will include their observed radius and mass distributions, the prevalence of F/G/K-type companions, as well as their membership to the Galactic thin disk, thick disk, and halo. These results are discussed briefly in the context of existing evolutionary models, pointing out the most important
differences to their predictions.
Para conexión remota:
https://zoom.us/j/95391681413
ID de reunión: 953 9168 1413
Código de acceso: 264310