Search Publications
Lithium and magnetic fields in giant stars. HD 232 862: a magnetic and lithium-rich giant
de Laverny, P.; de Medeiros, J. R.; Palacios, A. +5 more
Aims: We report the detection of an unusually high lithium content in HD 232 862, a field giant classified as a G8II star, and hosting a magnetic field.
Methods: With the spectropolarimeters ESPaDOnS at CFHT and NARVAL at TBL, we collected high resolution and high signal-to-noise spectra of three giants: HD 232 862, KU Peg and HD 21 018. From …
A Suzaku observation of the ULIRG IRAS19254-7245: discerning the AGN component
Ptak, A.; Reeves, J. N.; Braito, V. +3 more
We discuss a long Suzaku observation of IRAS 19254-7245 (also known as the Superantennae), one of the brightest and well studied Ultra Luminous Infrared Galaxies in the local Universe. This long observation provided the first detection of IRAS 19254-7245 above 10 keV, and a measurement of a 15-30 keV flux of ~5× 10-12 erg cm-2
The early phase of a H1743-322 outburst observed by INTEGRAL, RXTE, Swift, and XMM/Newton
Rodriguez, J.; Wilms, J.; Cadolle Bel, M. +7 more
Aims: We investigate the early phase of the first state change during the 2008 September-November outburst of H1743-322, first detected by the INTEGRAL satellite. We focus on the preliminary hard X-ray state with the aim of investigating the possible influence of this phase on the subsequent evolution during the outburst.
Methods: The outburst…
A surviving disk from a galaxy collision at z = 0.4
Yang, Y.; Flores, H.; Hammer, F. +2 more
Context: Spiral galaxies dominate the local galaxy population. Disks are known to be fragile to collisions. Thus it is worthwhile to probe under what conditions a disk can possibly survive such interactions.
Aims: We present a detailed morpho-kinematic study of a massive galaxy with two nuclei,
Detailed radio to soft γ-ray studies of the 2005 outburst of the new X-ray transient XTE J1818-245
D'Avanzo, P.; Campana, S.; Goldoni, P. +11 more
Context: XTE J1818-245 is an X-ray nova that experienced an outburst in 2005, as first seen by the <sl>RXTE</sl> satellite. The source was observed simultaneously at various wavelengths up to soft γ-rays with the <sl>INTEGRAL</sl> satellite, from 2005 February to September, during our <sl>INTEGRAL</sl> Target of…
The AGN nature of three INTEGRAL sources: IGR J18249-3243, IGR J19443+2117, and IGR J22292+6647
Masetti, N.; Gehrels, N.; Capitanio, F. +6 more
Context: The third INTEGRAL/IBIS survey has revealed several new hard X-ray sources, which are still unidentified or unclassified. To identify these sources, we need to find their counterparts at other wavelengths and then study their nature.
Aims: The aim of this work is to employ the capability of the X-ray telescope (XRT) onboard Swift to l…
Comparative clustering analysis of variable stars in the Hipparcos, OGLE Large Magellanic Cloud, and CoRoT exoplanet databases
Sarro, L. M.; Aerts, C.; Debosscher, J. +1 more
Context: Discovery of new variability classes in large surveys using multivariate statistics techniques such as clustering, relies heavily on the correct understanding of the distribution of known classes as point processes in parameter space.
Aims: Our objective is to analyze the correspondence between the classical stellar variability types …
Radio continuum and near-infrared study of the MGRO J2019+37 region
Luque-Escamilla, P. L.; Paredes, J. M.; Romero, G. E. +10 more
Context:
Continuous monitoring of pulse period variations in Hercules X-1 using Swift/BAT
Klochkov, D.; Santangelo, A.; Staubert, R. +2 more
Context: Monitoring of pulse period variations in accreting binary pulsars is an important tool to study the interaction between the magnetosphere of the neutron star and the accretion disk. While the X-ray flux of the brightest X-ray pulsars have been successfully monitored over many years (e.g. with RXTE/ASM, CGRO/BATSE, Swift/BAT), the possibil…
Comparison of the sidereal angular velocity of subphotospheric layers and small bright coronal structures during the declining phase of solar cycle 23
Roth, M.; Corbard, T.; Wöhl, H. +2 more
Context: We compare solar differential rotation of subphotospheric layers derived from local helioseismology analysis of GONG++ dopplergrams and the one derived from tracing small bright coronal structures (SBCS) using EIT/SOHO images for the period August 2001-December 2006, which correspond to the declining phase of solar cycle 23.
Aims: The…