Search Publications
Dusty disk winds at the sublimation rim of the highly inclined, low mass young stellar object SU Aurigae
Monnier, John D.; Kraus, Stefan; Baron, Fabien +11 more
Context. T Tauri stars are low-mass young stars whose disks provide the setting for planet formation. Despite this, their structure is poorly understood. We present new infrared interferometric observations of the SU Aurigae circumstellar environment that offer resolution that is three times higher and a better baseline position angle coverage tha…
Carbonaceous nano-dust emission in proto-planetary discs: the aliphatic-aromatic components
Ysard, N.; Dartois, E.; Habart, E. +3 more
Context. In the interstellar medium, carbon (nano-)grains are a major component of interstellar dust. This solid phase is more vulnerable to processing and destruction than its silicate counterpart. It exhibits a complex, size-dependent evolution that is due to interactions within different radiative and dynamical environments. Infrared signatures…
Global mapping of lunar refractory elements: multivariate regression vs. machine learning
Wöhler, C.; Grumpe, A.; Bhatt, M. +2 more
Context. The quantitative estimation of elemental concentrations at the spatial resolution of hyperspectral near-infrared (NIR) images of the lunar surface is an important tool for understanding the processes relevant for the origin and evolution of the Moon.
Aims: We aim to map the abundances of the elements Fe, Ca, and Mg at a typical accur…
Hinode EIS line widths in the quiet corona up to 1.5 R⊙
Mason, H. E.; Del Zanna, G.; Gupta, G. R.
We present an analysis of several Hinode Extreme-ultraviolet Imaging Spectrometer (EIS) observations of coronal line widths in the quiet Sun, up to 1.5 R⊙ radial distances. Significant variations are found, which indicates no damping of Alfvén waves in the quiescent corona. However, the uncertainties in estimating the instrumental width…
Consistent radial velocities of classical Cepheids from the cross-correlation technique
Kervella, P.; Anderson, R. I.; Trahin, B. +11 more
Context. Accurate radial velocities (vrad) of Cepheids are mandatory within the context of Cepheid distance measurements using the Baade-Wesselink technique. The most common vrad derivation method consists in cross-correlating the observed stellar spectra with a binary template and measuring a velocity on the resulting mean p…
Combined asteroseismology, spectroscopy, and astrometry of the CoRoT B2V target HD 170580
Poretti, E.; Rainer, M.; Aerts, C. +9 more
Context. Space asteroseismology reveals that stellar structure and evolution models of intermediate- and high-mass stars are in need of improvement in terms of angular momentum and chemical element transport.
Aims: We aim to probe the interior structure of a hot, massive star in the core-hydrogen-burning phase of its evolution.
Methods: …
Link between brightest cluster galaxy properties and large scale extensions of 38 DAFT/FADA and CLASH clusters in the redshift range 0.2 < z < 0.9
Adami, C.; Durret, F.; Márquez, I. +2 more
Context. In the context of large-scale structure formation, clusters of galaxies are located at the nodes of the cosmic web, and continue to accrete galaxies and groups along filaments. In some cases, they show a very large extension and a preferential direction. Brightest cluster galaxies (BCGs) are believed to grow through the accretion of many …
First results from a large-scale proper motion study of the Galactic centre
Nogueras-Lara, F.; Gallego-Calvente, A. T.; Dong, H. +4 more
Proper motion studies of stars in the centre of the Milky Way have typically been limited to the Arches and Quintuplet clusters, and to the central parsec. Here we present the first results of a large-scale proper motion study of stars within several tens of parsecs of Sagittarius A* based on our 0.2″ angular resolution GALACTICNUCLEUS survey (epo…
A stellar census in globular clusters with MUSE: A spectral catalogue of emission-line sources
Weilbacher, Peter M.; Kollatschny, Wolfram; Kamann, Sebastian +6 more
Aims: Globular clusters produce many exotic stars due to a much higher frequency of dynamical interactions in their dense stellar environments. Some of these objects were observed together with several hundred thousand other stars in our MUSE survey of 26 Galactic globular clusters. Assuming that at least a few exotic stars have exotic spectr…
Two cold belts in the debris disk around the G-type star NZ Lupi
Avenhaus, H.; Augereau, J. -C.; Henning, T. +36 more
Context. Planetary systems hold the imprint of the formation and of the evolution of planets especially at young ages, and in particular at the stage when the gas has dissipated leaving mostly secondary dust grains. The dynamical perturbation of planets in the dust distribution can be revealed with high-contrast imaging in a variety of structures.…