Contributed Talk - Splinter Stellar

Friday, 25 September 2020, 14:59   (virtual room M)

Studying the atmosphere of the close binary star system AADor with PHOENIX/3D

Fiona Prodöhl, Peter Hauschildt
Hamburger Sternwarte, Universität Hamburg

Model atmospheres for short period binary stars are not suitable for the standard “isolated” star approach. The outer boundary condition needs to account for an inwards directed radiative energy flow by the other binary component. This work aims to provide better theoretical models by using irradiated 1D and 3D modes of the atmosphere code PHOENIX. The AADor system is an excellent example of a well-studied non-mass transferring post-common envelope binary system. Its members are a sdOB-type primary and an extremely low mass secondary. I will present you how several 1D models combined to a 1.5D model can represent this system and compare these results to a PHOENIX/3D model that is able to include 3D effects like transverse radiation and transmission of light close to the terminator.