29 citations · 80 across the 9 of their papers we have counts for
9 papers
On the nature of the X-ray source in GK Per
Sonja Vrielmann, Jan-Uwe Ness, Juergen H. M. M. Schmitt
We report XMM-Newton observations of the intermediate polar (IP) GK Per on the rise to the 2002 outburst and compare them to Chandra observations during quiescence. We find an asym…
Is T Leonis a superoutbursting intermediate polar?
Sonja Vrielmann, Jan-Uwe Ness, Juergen H. M. M. Schmitt
We present an XMM-Newton analysis of the cataclysmic variable T Leo. The X-ray light curve shows sinusoidal variation on a period P_x equal to 0.89^{+0.14}_{-0.10} times the previo…
V2051 Oph's disc evolution on decline from superoutburst
Sonja Vrielmann, Warren Offutt
We present an Eclipse Mapping analysis of ten eclipses taken during decline from superoutburst of the dwarf nova V2051 Oph. On decline from superoutburst the disc cools down consid…
UU Aqr from high to low state
Sonja Vrielmann, Raymundo Baptista
In this paper we present Physical Parameter Eclipse Mapping (PPEM) of UBVRI eclipse light curves of UU Aqr from high to low states. We used a simple, pure hydrogen LTE model to der…
The Patchy Accretion Disc in HT Cassiopeiae
Sonja Vrielmann, Frederic V. Hessman, Keith Horne
We have reconstructed the temperatures and surface densities in the quiescent accretion disc in HT Cas by performing a "Physical Parameter Eclipse Mapping" analysis of archival UBV…
Physical Parameter Eclipse Mapping
Sonja Vrielmann
The tomographic method "Physical Parameter Eclipse Mapping" is a tool to reconstruct spatial distributions of physical parameters (like temperatures and surface densities) in accre…