Contributed Talk - Splinter HotStars

Friday, 16 September 2022, 15:20   (SFG 1030 / virtual HotStars)

A peek into the Hot subdwarfs through the lens of the SEDs

Ayesha Arshad Arain, Stephan Geier, Matti Dorsch
Institute for Physics and Astronomy, University of Potsdam

I will report about a project which involves working with a candidate sample catalogue of hot subdwarfs with good parallaxes using the SED (Spectral Energy Distribution) fitting method. This method is an efficient way for determining the physical parameters of single and sdO/B binaries with composite SEDs, many of which are newly identified. The goal of this study is to clean the sample catalogue of sdO/Bs from any contamination and to create a precise HR diagram for both the hot subdwarfs and their cool companions. In addition, the project is also aimed at searching for infrared excess in sdO/B SEDs that can not be reproduced by a cool companion: this allows the detection of cool disks and debris around hot subdwarfs.