2014/07/01 by I. Traulsen, K. Reinsch, Traulsen, I. +4
Engineering · Physics and Astronomy · #Astrophysical Phenomena and Observations #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #SAS software applications and methods #Solar and Stellar Astrophysics (astro-ph.SR) #X-ray Spectroscopy and Fluorescence Analysis #astro-ph.HE #astro-ph.SR
paper · pdf · doi:10.48550/arxiv.1407.0322
Accepted for publication in Acta Polytechnica, Proceedings of "The Golden Age of Cataclysmic Variables and Related Objects II"
arxiv created 2014/07/01 · openalex publication_date 2014/07/01 · arxiv updated 2014/07/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
High-energy data of accreting white dwarfs give access to the regime of the primary accretion-induced energy release and the different proposed accretion scenarios. We perform XMM-Newton observations of polars selected due to their ROSAT hardness ratios close to -1.0 and model the emission processes in accretion column and accretion region. Our models consider the multi-temperature structure of the emission regions and are mainly determined by mass-flow density, magnetic field strength, and white-dwarf mass. To describe the full spectral energy distribution from infrared to X-rays in a physically consistent way, we include the stellar contributions and establish composite models, which will also be of relevance for future X-ray missions. We confirm the X-ray soft nature of three polars.