English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

RS Cae is the third target in our series of XMM-Newton observations of softX-ray-dominated polars. Our observational campaign aims to better understandand describe the multiwavelength data, the physical properties of the systemcomponents, and the short- and long-term behavior of the component fluxes in RSCae. We employ stellar atmosphere, stratified accretion-column, and widely usedX-ray spectral models. We fit the XMM-Newton spectra, model the multiband lightcurves, and opt for a mostly consistent description of the spectral energydistribution.  Results. Our XMM-Newton data of RS Cae are clearly dominated by soft X-rayemission. The X-ray light curves are shaped by emission from the main accretionregion, which is visible over the whole orbital cycle, interrupted only by astream eclipse. The optical light curves are formed by cyclotron and streamemission. The XMM-Newton X-ray spectra comprise a black-body-like and a plasmacomponent at mean temperatures of 36eV and 7keV. The spectral fits giveevidence of a partially absorbing and a reflection component. Multitemperaturemodels, covering a broader temperature range in the X-ray emitting accretionregions, reproduce the spectra appropriately well. Including archival data, wedescribe the spectral energy distribution with a combination of models based ona consistent set of parameters and derive a lower limit estimate of thedistance d > 750pc.  Conclusions. The high bolometric soft-to-hard flux ratios and short-termvariability of the (X-ray) light curves are characteristic of inhomogeneousaccretion. RS Cae clearly belongs in the group of polars that show a verystrong soft X-ray flux compared to their hard X-ray flux. The differentblack-body fluxes and similar hard X-ray and optical fluxes during theXMM-Newton and ROSAT observations show that soft and hard X-ray emission arenot directly correlated.

Phase-resolved X-ray spectroscopy and spectral energy distribution of the X-ray soft polar RS Caeli