Search Publications
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…
Role of emission angular directionality in spin determination of accreting black holes with a broad iron line
Dovčiak, M.; Karas, V.; Svoboda, J. +1 more
Aims: The spin of an accreting black hole can be determined by spectroscopy of the emission and absorption features produced in the inner regions of an accretion disc. In this work, we discuss the method employing the relativistic line profiles of iron in the X-ray domain, where the emergent spectrum is blurred by general relativistic effects.
Mode width fitting with a simple Bayesian approach. Application to CoRoT targets HD 181420 and HD 49933
Appourchaux, T.; Boumier, P.; Gaulme, P.
Aims: We investigate the asteroseismology of two solar-like targets as observed with the CoRoT satellite, with particular attention paid to the mode fitting. HD 181420 and HD 49933 are typical CoRoT solar-like targets (156 and 60-day runs). The low signal-to-noise ratio (SNR) of about 3{-}10 prevents us from unambiguously identifying the individua…
The young stellar population at the center of NGC 205
Bellazzini, M.; Saviane, I.; Monaco, L. +5 more
Context: NGC 205 is a peculiar dwarf elliptical galaxy hosting in its center a population of young blue stars. Their origin is still matter of debate, the central fresh star formation activity possibly being related to dynamical interactions between NGC 205 and M 31.
Aims: The star formation history in the central 30´´ (~120 pc) around the NGC…
Variations in the dip properties of the low-mass X-ray binary XB 1254-690 observed with XMM-Newton and INTEGRAL
Díaz Trigo, M.; Parmar, A. N.; Boirin, L. +3 more
We have analysed data from five XMM-Newton observations of XB 1254-690, one of them simultaneous with INTEGRAL, to investigate the mechanism responsible for the highly variable dip durations and depths seen from this low-mass X-ray binary. Deep dips were present during two observations, shallow dips during one and no dips were detected during the …