Search Publications
A multiwavelength investigation of the massive eclipsing binary Cygnus OB2 #5
Damerdji, Y.; Rauw, G.; Vreux, J. -M. +5 more
Context: The properties of the early-type binary
Aims: We have attempted to constrain the physical properties of the binary by collecting new optical and X-ray observations.
Methods: The optical light…
Benchmarking atomic data for astrophysics: Fe VIII EUV lines
Del Zanna, G.
The EUV spectrum of ion{Fe}{viii} is reviewed, using new solar observations from the Hinode EUV Imaging Spectrometer (EIS), together with older solar and laboratory data. The most up-to-date scattering calculations are benchmarked against these experimental data, with the use of a large atomic structure calculation. Once adjustments are made to th…
Mid-infrared imaging of 25 local AGN with VLT-VISIR
Gandhi, P.; Duschl, W. J.; Smette, A. +1 more
Context: High angular resolution N-band imaging is used to discern the torus of active galactic nuclei (AGN) from its environment in order to allow a comparison of its mid-infrared properties to the expectations of the unified scenario for AGN.
Aims: We present VLT-VISIR images of 25 low-redshift AGN of different Seyfert types, as well as N-ba…
Forward modelling to determine the observational signatures of propagating slow waves for TRACE, SoHO/CDS, and Hinode/EIS
Hood, A. W.; De Moortel, I.; Owen, N. R.
Context: The propagation and damping of slow MHD waves in the solar atmosphere are investigated by numerical simulations and forward modelling, with particular emphasis placed on waves with periodicities of the order of five minutes.
Aims: We extend a coronal model by adding an equilibrium temperature gradient allowing study of wave propagatio…
Effective area calibration of the reflection grating spectrometers of XMM-Newton. I. X-ray spectroscopy of the Crab nebula
Kaastra, J. S.; Costantini, E.; de Vries, C. P. +1 more
Context: The Crab nebula and pulsar have been widely used as a calibration source for X-ray instruments. The in-flight effective area calibration of the Reflection Grating Spectrometers (RGS) of XMM-Newton depend upon the availability of reliable calibration sources.
Aims: We investigate how the absolute effective area calibration of RGS can b…
The EROS2 search for microlensing events towards the spiral arms: the complete seven season results
Couchot, F.; Perdereau, O.; Andersen, J. +37 more
Aims: The EROS-2 project has been designed to search for microlensing events towards any dense stellar field. The densest parts of the Galactic spiral arms have been monitored to maximize the microlensing signal expected from the stars of the Galactic disk and bulge.
Methods: 12.9 million stars have been monitored during 7 seasons towards 4 di…
Low-amplitude variations detected by CoRoT in the B8IIIe star HD 175869
Auvergne, M.; Chaintreuil, S.; Michel, E. +20 more
Context: The origin of the short-term variability in Be stars remains a matter of controversy. Pulsations and rotational modulation are the components of the favored hypothesis.
Aims: We present our analysis of CoRoT data of the B8IIIe star HD 175869 observed during the first short run in the center direction (SRC1).
Methods: We review bot…
The updated spectral catalogue of INTEGRAL gamma-ray bursts
Götz, D.; Mereghetti, S.; Vianello, G.
We present a catalogue with the properties of all the bursts detected and localized by the IBIS instrument onboard the INTEGRAL satellite from November 2002 to September 2008. The sample is composed of 56 bursts, corresponding to a rate of ~0.8 GRB per month. Thanks to the performances of the INTEGRAL Burst Alert System, 50% of the IBIS GRBs have …
Revealing the sub-AU asymmetries of the inner dust rim in the disk around the Herbig Ae star R Coronae Austrinae
Weigelt, G.; Hofmann, K. -H.; Meilland, A. +5 more
Context: Unveiling the structure of the disks around intermediate-mass pre-main-sequence stars (Herbig Ae/Be stars) is essential for our understanding of the star and planet formation process. In particular, models predict that in the innermost AU around the star, the dust disk forms a “puffed-up” inner rim, which should result in a strongly asymm…
Near-IR search for lensed supernovae behind galaxy clusters. II. First detection and future prospects
Lidman, C.; Amanullah, R.; Goobar, A. +11 more
Aims: Powerful gravitational telescopes in the form of massive galaxy clusters can be used to enhance the light collecting power over a limited field of view by about an order of magnitude in flux. This effect is exploited here to increase the depth of a survey for lensed supernovae at near-IR wavelengths.
Methods: We present a pilot supernova…