161 citations · 2.7k across the 88 of their papers we have counts for
6 papers · 1 filter
Spatially resolved X-ray emission of EQ Pegasi
J. Robrade, J. -U. Ness, J. H. M. M. Schmitt
We present an analysis of an XMM-Newton observation of the M dwarf binary EQ Pegasi with a special focus on the the spatial structure of the X-ray emission and the analysis of ligh…
Coronal abundances from high-resolution X-ray data: The case of Algol
J. H. M. M. Schmitt, J. -U. Ness
We discuss the determination of elemental abundances from high resolution X-ray data. We emphasize the need for an accurate determination of the underlying temperature structure an…
A spatially resolved limb flare on Algol B observed with XMM-Newton
J. H. M. M. Schmitt, J. -U. Ness, G. Franco
We report XMM-Newton observations of the eclipsing binary Algol A (B8V) and B (K2III). The XMM-Newton data cover the phase interval 0.35 - 0.58, i.e., specifically the time of opti…
Modeling the NeIX Triplet Spectral Region of Capella with the Chandra and XMM-Newton Gratings
Jan-Uwe Ness
High resolution X-ray spectroscopy with the diffraction gratings of Chandra and XMM-Newton offers new chances to study a large variety of stellar coronal phenomena. A popular X-ray…
A Chandra LETGS observation of V4743 Sagittarius: A Super Soft X-ray Source and a Violently Variable Light Curve
J. -U. Ness, S. Starrfield, V. Burwitz +13
V4743 Sgr (Nova Sgr 2002 No. 3) was discovered on 20 September 2002. We obtained a 5ks ACIS-S spectrum in November 2002 and found that the nova was faint in X-rays. We then obtaine…
Are stellar coronae optically thin in X-rays? - A systematic investigation of opacity effects
J. -U. Ness, J. H. M. M. Schmitt, M. Audard +2
The relevance of resonant scattering (absorption by photo-excitation and re-emission out of the line of sight) in the solar corona has always been discussed controversially. Ratios…