Search Publications
The close circumstellar environment of Betelgeuse. II. Diffraction-limited spectro-imaging from 7.76 to 19.50 µm with VLT/VISIR
Kervella, P.; Chiavassa, A.; Verhoelst, T. +4 more
Context. Mass-loss occurring in red supergiants (RSGs) is a major contributor to the enrichment of the interstellar medium in dust and molecules. The physical mechanism of this mass loss is however relatively poorly known. Betelgeuse is the nearest RSG, and as such a prime object for high angular resolution observations of its surface (by interfer…
Cosmic rays and the magnetic field in the nearby starburst galaxy NGC 253 III. Helical magnetic fields in the nuclear outflow
Dettmar, R. -J.; Beck, R.; Krause, M. +1 more
Context. Magnetic fields are good tracers of gas compression by shock waves in the interstellar medium. These can be caused by the interaction of star-formation driven outflows from individual star formation sites as described in the chimney model. Integration along the line-of-sight and cosmic-ray diffusion may hamper detection of compressed magn…
Amplitudes and lifetimes of solar-like oscillations observed by CoRoT. Red-giant versus main-sequence stars
Goupil, M. -J.; Baudin, F.; Hatzes, A. P. +12 more
Context. The advent of space-borne missions such as CoRoT or Kepler providing photometric data has brought new possibilities for asteroseismology across the H-R diagram. Solar-like oscillations are now observed in many stars, including red giants and main-sequence stars.
Aims: Based on several hundred identified pulsating red giants, we aim t…
The optically bright post-AGB population of the LMC
Wood, P. R.; van Winckel, H.; Lloyd Evans, T. +3 more
Context. The detected variety in chemistry and circumstellar shell morphology of the limited sample of Galactic post-asymptotic giant branch (AGB) stars is so large that there is no consensus yet on how the different objects are linked by evolutionary channels. The evaluation is complicated by the fact that their distances and hence luminosities r…
Cross-correlation of the 2XMMi catalogue with Data Release 7 of the Sloan Digital Sky Survey
Motch, C.; Carrera, F.; Pineau, F. -X. +5 more
The Survey Science Centre of the XMM-Newton satellite released the first incremental version of the 2XMM catalogue in August 2008. Containing more than 220 000 X-ray sources, the 2XMMi was at that time the largest catalogue of X-ray sources ever published and thus constitutes an unprecedented resource for studying the high-energy properties of var…
A lepto-hadronic model for high-energy emission from FR I radiogalaxies
Romero, G. E.; Medina, M. C.; Reynoso, M. M.
Context. The well known radiogalaxy Cen A has been recently detected as a source of very high energy (VHE) γ-rays by the HESS experiment just before Fermi/LAT detected it at high energies (HE). The detection, together with that of M 87, established radiogalaxies as VHE γ-ray emitters.
Aims: The aim of this work is to present a lepto-hadronic …
Constraining the structure of the planet-forming region in the disk of the Herbig Be star HD 100546
Pinte, C.; Ménard, F.; Weigelt, G. +8 more
Context. Studying the physical conditions in circumstellar disks is a crucial step toward understanding planet formation and disk evolution. Of particular interest is the case of HD 100546, a Herbig Be star that presents a gap within the first 13 AU of its protoplanetary disk, a gap that may originate in the dynamical interactions of a forming pla…
Discovery of close binary central stars in the planetary nebulae NGC 6326 and NGC 6778
Corradi, R. L. M.; Santander-García, M.; Boffin, H. M. J. +3 more
We present observations proving the close binary nature of the central stars belonging to the planetary nebulae (PNe) NGC 6326 and NGC 6778. Photometric monitoring reveals irradiated lightcurves with orbital periods of 0.372 and 0.1534 days, respectively, constituting firm evidence that they passed through a common-envelope (CE) phase. Unlike most…
Planck early results. XIV. ERCSC validation and extreme radio sources
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +215 more
Planck's all-sky surveys at 30-857 GHz provide an unprecedented opportunity to follow the radio spectra of a large sample of extragalactic sources to frequencies 2-20 times higher than allowed by past, large-area, ground-based surveys. We combine the results of the Planck Early Release Compact Source Catalog (ERCSC) with quasi-simultaneous ground-…
Damped large amplitude transverse oscillations in an EUV solar prominence, triggered by large-scale transient coronal waves
Foullon, C.; Nakariakov, V. M.; Verwichte, E. +1 more
Aims: We investigate two successive trains of large amplitude transverse oscillations in an arched EUV prominence, observed with SoHO/EIT on the north-east solar limb on 30 July 2005. The oscillatory trains are triggered by two large scale coronal waves, associated with an X-class and a C-class flare occurring in the same remote active region…