13 papers
X-ray Variability of Active Galactic Nuclei and the Flare Model
R. W. Goosmann, B. Czerny, A. -M. Dumont +4
Short-term variability of X-ray spectra has been reported for several Active Galactic Nuclei. Significant X-ray flux variations are observed within time scales down to 10^4 -- 10^5…
X-ray Variability of AGN and the Flare Model
R. W. Goosmann, B. Czerny, A. -M. Dumont +2
Short-term variability of X-ray continuum spectra has been reported for several Active Galactic Nuclei. Significant X-ray flux variations are observed within time scales down to 10…
The CNO problem in magnetic cataclysmic variables
Jean-Marc Bonnet-Bidaud, Martine Mouchet
Some magnetic CVs like BY Cam are characterized by unusual CNO line ratios compared to other polars and non-solar abundances have been suggested to explain this anomaly. We present…
A white dwarf with a low magnetic field in the IP RXJ0028.8+5917/V709Cas
J. M. Bonnet-Bidaud, M. Mouchet, D. de Martino +2
We report the first detailed spectroscopic observations of the recently identified intermediate polar RXJ0028.8+5917/V709 Cas. We discovered that the system shows significant EW ~…
Modelling of the X-ray broad absorption features in Narrow-Line Seyfert 1s
D. Porquet, M. Mouchet, A. -M. Dumont
We investigate the origin of the broad absorption features detected near 1-1.4 keV in several Narrow Line Seyfert 1 galaxies, by modelling the absorbing medium with various physica…
BeppoSAX observations of AM Herculis in intermediate and high states
G. Matt, D. de Martino, B. T. Gaensicke +5
Temporal and spectral analyses from BeppoSAX observations of AM Her performed during both an intermediate and a high state are presented and discussed. Optical observations taken a…