Contributed Talk - Splinter HotStars

Thursday, 15 September 2022, 15:05   (SFG 1030 / virtual HotStars)

Radial velocity variability of red giants and blue horizontal branch stars

Marie Scheffen, Stephan Geier, Max Pritzkuleit
Institute for Physics and Astronomy, University of Potsdam

Binary systems make up most of the stellar population in our universe. Yet, there are still many gaps in our understanding of their evolution. As part of a research project to study the transition phase between hot subluminous stars and their progenitor systems, focusing on the role of binary interactions in the evolutionary process, the spectra of 14 red giants (RG), selected from a 500 pc radius volume sample, have been obtained using the Ondřejov Echelle Spectrograph (OES). Additional 6 blue horizontal branch (BHB) stars, selected from a BHB stars all-sky catalogue, were observed as preparation of a survey of 180 bright BHB stars with the OES. By implementing the method of radial velocity variation across different epochs, binary candidates and possible hot subdwarf progenitor systems within this sample of stars were identified and will be presented along with an evaluation of the quality of BHB spectra taken with the OES.