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

A cataclysmic variable is a binary system consisting of a white dwarf thataccretes material from a secondary object via the Roche-lobe mechanism. In thecase of long enough observation, a detailed temporal analysis can be performed,allowing the physical properties of the binary system to be determined. Wepresent an XMM-Newton observation of the dwarf nova HT Cas acquired to resolvethe binary system eclipses and constrain the origin of the X-rays observed. Wealso compare our results with previous ROSAT and ASCA data. After the spectralanalysis of the three EPIC camera signals, the observed X-ray light curve wasstudied with well known techniques and the eclipse contact points obtained.  The X-ray spectrum can be described by thermal bremsstrahlung of temperature$kT_1=6.89 \pm 0.23$ keV plus a black-body component (upper limit) withtemperature $kT_2=30_{-6}^{+8}$ eV. Neglecting the black-body, the bolometricabsorption corrected flux is $F^{\rm{Bol}}=(6.5\pm 0.1)\times10^{-12}$ ergs$^{-1}$ cm$^{-2}$, which, for a distance of HT Cas of 131 pc, corresponds to abolometric luminosity of $(1.33\pm 0.02)\times10^{31}$ erg s$^{-1}$.  The study of the eclipse in the EPIC light curve permits us to constrain thesize and location of the X-ray emitting region, which turns out to be close tothe white dwarf radius. We measure an X-ray eclipse somewhat smaller (but onlyat a level of $\simeq 1.5 \sigma$) than the corresponding optical one. If thisis the case, we have possibly identified the signature of either high latitudeemission or a layer of X-ray emitting material partially obscured by anaccretion disk.

The X-ray eclipse of the dwarf nova HT CAS observed by the XMM-Newton satellite: spectral and timing analysis