Search Publications
The complex FeK line of the Narrow-Line Seyfert 1 galaxy IRAS 13349+2438
Nandra, K.; Cappi, M.; Dadina, M. +2 more
The observation of the Narrow-Line Seyfert 1 galaxy IRAS 13349+2438 performed by XMM-Newton European Photon Imaging Camera between 0.3-10 keV, is presented here. The broadband spectrum of the source is dominated at low energies (E <=2 keV) by a strong excess of emission and by complex emission/absorption features between ~ 5.5-8.0 keV. The soft…
The Small Magellanic Cloud in the far infrared. I. ISO's 170 mu m map and revisit of the IRAS 12-100 mu m data
Lemke, D.; Klaas, U.; Haas, M. +3 more
The ISOPHOT experiment onboard the ISO satellite generated a complete view of the Small Magellanic Cloud (SMC) at 170 mu m with 1.5 arcmin resolution. The map is analysed using an automated photometry program enabling accurate photometric characterization of the far infrared (FIR) emitting regions. An integrated FIR luminosity of 8.5x 107
XMM-Newton study of the star forming region NGC 1333
Preibisch, T.
We analyze the data of a deep XMM-Newton X-ray imaging observation of the NGC 1333 star forming region. The observation covered a period of about 14 hours and has a total MOS-equivalent exposure time of 235 ksec. In addition to 46 bright X-ray sources revealed by source detection routines, we find weak X-ray emission at the positions of 40 X-ray s…
Sensitivity kernels for time-distance inversion based on the Rytov approximation
Pijpers, F. P.; Jensen, J. M.
The study of the solar convection zone has been given a new impetus with what promises to be a very powerful new tool in time-distance helioseismology (Duvall et al. \cite{DJHP93}). Using data obtained with this technique, it has become possible to do a tomographic reconstruction of structures in the convection zone. Most of the work done on inver…
The high-velocity outflow in the proto-planetary nebula Hen 3-1475
García-Lario, P.; Riera, A.; Manchado, A. +2 more
The proto-planetary nebula Hen 3-1475 shows a remarkable highly collimated optical jet with an S-shaped string of three pairs of knots and extremely high velocities. We present here a detailed analysis of the overall morphology, kinematic structure and the excitation conditions of these knots based on deep ground-based high dispersion spectroscopy…
Properties of the solar velocity field indicated by motions of coronal bright points
Vršnak, B.; Wöhl, H.; Clette, F. +3 more
Full-disc solar images obtained with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) are used to analyse properties of the solar velocity field by tracing coronal bright points from June 4, 1998 to May 22, 1999. Rotation velocity residuals, meridional motions and their relationship are investi…
XMM-Newton study of the Serpens star-forming region
Preibisch, T.
We analyze a XMM-Newton X-ray observation of the Serpens dark cloud with a total MOS-equivalent exposure time of 57 ksec. We find 45 individual X-ray sources. None of the class 0 protostars, only one of the class I protostars, and two of the flat-spectrum objects in the region are detected in X-rays. The optically invisible flat-spectrum source EC…
Discovery of the eclipse in the symbiotic binary Z Andromedae
Skopal, A.
Our photometric observations of the symbiotic binary Z And during its recent (2000-2003) active phase revealed a minimum in the U, B and V light curves (LC) at the position of the inferior conjunction of its cool component (the orbital phase varphi = 0). This fact and the behaviour of colour indices suggest that the minimum was due to the eclipse …
A photometric monitoring of bright high-amplitude delta Scuti stars. II. Period updates for seven stars
Derekas, A.; Mészáros, Sz.; Rodríguez, E. +10 more
We present new photometric data for seven high-amplitude delta Scuti stars. The observations were acquired between 1996 and 2002, mostly in the Johnson photometric system. For one star (GW UMa), our observations are the first since the discovery of its pulsational nature from the Hipparcos data. The primary goal of this project was to update our k…
Oscillations in the wings of sunspot transition region lines
Wilhelm, K.; Kjeldseth-Moe, O.; Brynildsen, N. +1 more
We explore a new approach to the investigation of optically thin emission lines by comparing the intensity variations in opposite wings of the spectral lines and apply the method to investigate the oscillations above sunspots. The observations show that it is easier to detect the 3 min oscillations above sunspots in the short wavelength (``blue'')…