Search Publications
Imaging the circumstellar dust around AGB stars with PolCor
Olofsson, G.; Olofsson, H.; Schöier, F. L. +2 more
Aims: The aim of this paper is to investigate how the new imaging Polarimeter and Coronograph (PolCor) at the Nordic Optical Telescope (NOT) can be used in the study of circumstellar structures around AGB stars. The purpose is to prepare for a study of a larger sample.
Methods: We have observed two types of AGB stars using the PolCor ins…
Observing and modeling the dynamic atmosphere of the low mass-loss C-star R Sculptoris at high angular resolution
Höfner, S.; Verhoelst, T.; Hron, J. +4 more
Context. We study the circumstellar environment of the carbon-rich star R Sculptoris using the near- and mid-infrared high spatial resolution observations from the ESO-VLTI focal instruments VINCI and MIDI, respectively.
Aims: These observations aim at increasing our knowledge of the dynamic processes in play within the very close circumstell…
Hinode/EIS plasma diagnostics in the flaring solar chromosphere
Fletcher, L.; Hannah, I. G.; Graham, D. R.
Context. The impulsive phase of solar flares is a time of rapid energy deposition and heating in the lower solar atmosphere, leading to changes in the temperature, density, ionisation and velocity structure of this region.
Aims: We aim to study the lower atmosphere during the impulsive phase of a flare using imaging and spectroscopic data fro…
On the evolution of environmental and mass properties of strong lens galaxies in COSMOS
Finoguenov, A.; Kneib, J. -P.; Ilbert, O. +11 more
Context. Nearly 100 new strong-lens candidates have been discovered in the COSMOS field. Among these, 20 lens candidates with 0.34 ≲ zlens ≲ 1.13 feature multiple images of background sources.
Aims: Using the multi-wavelength coverage of the field and its spectroscopic follow-up, we characterize the evolution with redshift of the e…
Abell 611. II. X-ray and strong lensing analyses
Giordano, F.; Ettori, S.; Gavazzi, R. +10 more
We present the results of our analyses of the X-ray emission and of the strong lensing systems in the galaxy cluster Abell 611 [z = 0.288]. This cluster is an optimal candidate for a comparison of the mass reconstructions obtained through X-ray and lensing techniques, because of its very relaxed dynamical appearance and its exceptional strong lens…
The extent of dust in NGC 891 from Herschel/SPIRE images
Bianchi, S.; Xilouris, E. M.
We analyse Herschel/SPIRE images of the edge-on spiral galaxy NGC 891 at 250, 350, and 500 µm. Using a 3D radiative transfer model we confirm that the dust has radial fall-off similar to the stellar disk. The dust disk shows a break at about 12 kpc from the centre, where the profile becomes steeper. Beyond this break, emission can be traced …
Discovery of multiple dust shells beyond 1 arcmin in the circumstellar envelope of IRC +10216 using Herschel/PACS
Blommaert, J. A. D. L.; Barlow, M. J.; Ottensamer, R. +9 more
We present new Herschel/PACS images at 70, 100, and 160 µm of the well-known, nearby, carbon-rich asymptotic giant branch star IRC+10216 revealing multiple dust shells in its circumstellar envelope. For the first time, dust shells (or arcs) are detected until 320''. The almost spherical shells are non-concentric and have an angular extent be…
Star-formation efficiency and metal enrichment of the intracluster medium in local massive clusters of galaxies
Zhang, Y. -Y.; Schneider, P.; Reiprich, T. H. +3 more
We have investigated the baryon-mass content in a subsample of 19 clusters of galaxies extracted from the X-ray flux-limited sample HIFLUGCS according to their positions in the sky. For these clusters, we measured total masses and characteristic radii on the basis of a rich optical spectroscopic data set, the physical properties of the intracluste…
Plaskett's star: analysis of the CoRoT photometric data
Auvergne, M.; Gosset, E.; Baudin, F. +13 more
Context. The second short run (SRa02) of the CoRoT space mission for asteroseismology was partly devoted to stars belonging to the Mon OB2 association. An intense monitoring has been performed on Plaskett's star (HD 47129) and the unprecedented quality of the light curve allows us to shed new light on this very massive, non-eclipsing binary system…
A deep wide-field sub-mm survey of the Carina Nebula complex
Menten, K. M.; Preibisch, T.; Zinnecker, H. +3 more
Context. The Great Nebula in Carina is one of the most massive (Mast,total ⪆ 25 000 M_⊙) star-forming complexes in our Galaxy and contains several stars with (initial) masses exceeding ≈ 100 M_⊙; it is therefore a superb location in which to study the physics of violent massive star-formation and the resulting feedback effects, includin…