Search Publications
The XMM-Newton view of stellar coronae: High-resolution X-ray spectroscopy of Capella
Bromage, G. E.; Raassen, A. J. J.; Mewe, R. +5 more
We present the high-resolution RGS X-ray spectrum of the stellar binary Capella observed by the XMM-Newton satellite. A multi-thermal approach has first been applied to fit the data and derive elemental abundances. Using the latter, the emission measure distribution has been reconstructed using a Chebychev polynomial fit. Its shape is found to dis…
Time-resolved spectral analysis of the pulsating helium star V652 Her
Jeffery, C. S.; Woolf, V. M.; Pollacco, D. L.
A series of 59 moderate-resolution high signal-to-noise spectra of the pulsating helium star
Search for NH3 ice in cold dust envelopes around YSOs
Dartois, E.; d'Hendecourt, L.
We present a study of the 3.1 micron absorption band, attributed to the OH stretching mode of the water molecule in the form of solid ice, observed in many protostellar lines of sight by the SWS instrument on board ISO. Using ice optical constants and Mie theory, we obtain reasonable fits to the peculiar band shapes observed in twelve sources. The…
Helium-like triplet density diagnostics. Applications to CHANDRA-LETGS X-ray observations of Capella and Procyon
Schmitt, J. H. M. M.; Kaastra, J. S.; Burwitz, V. +6 more
Electron density diagnostics based on the triplets of helium-like C v, N vi, and O vii are applied to the X-ray spectra of Capella and Procyon measured with the Low Energy Transmission Grating Spectrometer (LETGS) on board the Chandra X-ray Observatory. New theoretical models for the calculation of the line ratios between the forbidden (f), interc…
Non-axisymmetric accretion on the classical TTS RW Aur A
Tuominen, I.; Gahm, G. F.; Gameiro, J. F. +5 more
High-resolution spectroscopic monitoring of the exceptionally active classical T Tauri star (CTTS) RW Aur A was carried out in three seasons of 1996, 1998 and 1999 with simultaneous B, V photometry. The high quality spectra revealed a multicomponent structure of the spectrum, which includes: 1) a veiled photospheric spectrum of a K1-K4 star, 2) br…
XMM-Newton observation of an unusual iron line in the quasar Markarian 205
Boller, Th.; O'Brien, P. T.; Reeves, J. N. +5 more
XMM-Newton observations of the low luminosity, radio-quiet quasar Markarian 205 have revealed a unique iron K emission line profile. In marked contrast to the broad and redshifted iron K line commonly seen in ASCA observations of Seyfert 1 galaxies, we find that a substantial amount of the line flux in Mrk 205 occurs above the neutral line energy …
XMM-Newton observations of NGC 253 : Resolving the emission components in the disk and nuclear area
Pietsch, W.; Read, A. M.; Ptak, A. +12 more
We describe the first XMM-Newton observations of the starburst galaxy
The XMM-Newton view of stellar coronae: Flare heating in the coronae of HR 1099
Mewe, R.; Audard, M.; Güdel, M.
The RS CVn system HR 1099 was observed by XMM-Newton for a time span of 25 days during the commissioning phase. Rotational modulation in the RGS light curve has been detected with maximum flux when the active K1 IV star is in front. Following a quiescent phase of emission, the rise and peak of a large flare were observed. Time-dependent spectrosco…
XMM-Newton observations of the cluster of galaxies Abell 496. Measurements of the elemental abundances in the intracluster medium
Kaastra, J. S.; Molendi, S.; Ferrigno, C. +2 more
The results from XMM-Newton observations of the relaxed cluster of galaxies Abell 496 are presented. The spatially-resolved X-ray spectra taken by the European Photon Imaging Cameras show a temperature drop and a Fe abundance increase in the intra-cluster medium (ICM) towards the cD galaxy at the cluster center. The abundances of Si and S also sho…
The X-ray spectrum of the supernova remnant 1E 0102.2-7219
Behar, E.; Kahn, S. M.; den Herder, J. W. +2 more
In this letter we present the soft X-ray (5-35 Å) spectrum of the supernova remnant (SNR)