Search Publications
New insights on the complex planetary nebula Hen 2-113
Lopez, B.; Chesneau, O.; Zijlstra, A. A. +6 more
We report on infrared observations of the planetary nebula Hen 2-113 obtained with VLT/NACO, VLTI/MIDI, VLT/ISAAC and TIMMI at the ESO 3.6 m. Hen 2-113 exhibits a clear ring-like structure superimposed to a more diffuse environment visible in the L' (3.8 µm), M' (4.78 µm) and 8.7 µm bands. No clear core at 8.7 µm and no fri…
Orbits of new Hipparcos binaries. II
Weigelt, G.; Hofmann, K. -H.; Schertl, D. +4 more
We continue the presentation of new orbits for Hipparcos binaries determined from regular speckle interferometric observations. Most of the data were collected in the period between 1998.77 and 2004.82 using the 6 m BTA telescope
of the Special Astrophysical Observatory in Zelenchuk. New orbits are presented for six pairs: HIP 4809, HIP 4849,…The X-ray properties of the magnetic cataclysmic variable UU Columbae
Mukai, K.; Haberl, F.; Burwitz, V. +5 more
Aims.XMM-Newton observations to determine for the first time the broad-band X-ray properties of the faint, high galactic latitude intermediate polar UU Col are presented.
Methods: .We performed X-ray timing analysis in different energy ranges of the EPIC cameras, which reveals the dominance of the 863 s white dwarf rotational period. The spin …
Multi-wavelength study of the gravitational lens system RXS J113155.4-123155. I. Multi-epoch optical and near infrared imaging
Altieri, B.; Jean, C.; Surdej, J. +6 more
Aims.RXS J113155.4-123155 (z=0.66) is a quadruply imaged lensed quasar with a resolved Einstein Ring. The goal of this paper is to provide a full characterization of this system, and more particularly accurate astrometry and photometry. These observational constraints constitute a mandatory ingredient for the precise determination of the lens mass…
A multi-wavelength census of star formation activity in the young embedded cluster around Serpens/G3-G6
Olofsson, G.; André, Ph.; Bontemps, S. +4 more
Aims.The aim of this paper is to characterise the star formation activity in the poorly studied embedded cluster Serpens/G3-G6, located ~45 arcmin (3 pc) to the south of the Serpens Cloud Core, and to determine the luminosity and mass functions of its population of Young Stellar Objects (YSOs).
Methods: .Multi-wavelength broadband photometry …
XMM-Newton observations of the Coma cluster relic 1253+275
Feretti, L.; Neumann, D. M.
Aims.Using XMM Newton data, we investigate the nature of the X-ray emission in the radio relic 1253+275 in the Coma cluster. We determine the conditions of the cluster gas to check current models of relic formation, and we set constraints on the intracluster magnetic field.
Methods: .Both imaging and spectral analysis are performed, and the X…
Resolved Hubble space spectroscopy of ultracool binary systems
Martín, E. L.; Bouy, H.; Brandner, W. +4 more
Using the low-resolution mode of the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST), we obtain spectra from 20 spatially-resolved, ultracool dwarfs, eighteen of which belong to nine very low-mass binary systems with known angular separations in the range 0.37 arcsec-0.098 arcsec. For these dwarfs, we derive the…
Evidence for T Tauri-like emission in the EXor V1118 Ori from near-IR and X-ray data
Larionov, V. M.; Arkharov, A. A.; Puccetti, S. +6 more
Aims.We present a near-IR study of the EXor variable V1118 Ori, performed by following a slightly declining phase after a recent outburst. In particular, the near-IR (0.8-2.3 µm) spectrum, obtained for the first time, shows a wide variety of emission features of the H I (Paschen and Brackett series), He I recombination, and CO overtone.
M…
Dwarf elliptical galaxies in Centaurus A group: stellar populations in AM 1339-445 and AM 1343-452
Rejkuba, M.; Da Costa, G. S.; Zoccali, M. +2 more
We study the red giant populations of two dE galaxies, AM 1339-445 and AM 1343-452, with the aim of investigating the number and luminosity of any upper asymptotic giant branch (AGB) stars present. The galaxies are members of the Centaurus A group (D ≈ 3.8 Mpc) and are classified as outlying (R ≈ 350 kpc) satellites of Cen A. The analysis is based…
GRB 050223 : a dark GRB in a dusty starburst galaxy
Cimatti, A.; Le Floc'h, E.; Piro, L. +19 more
Aims.We aim at detecting and determining the properties of the host galaxy of the dark
Methods: .We use VLT optical/NIR images coupled to Swift X-ray positioning, and optical spectra of the host galaxy to measure its properties.
Results: .We find a single galaxy within the Swift error box of