Search Publications
The production of craters on the mid-sized Saturnian satellites by Centaur objects
Di Sisto, R. P.; Zanardi, M.
Context. The Saturnian satellite system has been observed in detail by the Cassini-Huygens mission. These satellites present different surface features, including impact craters caused by small objects probably coming from the trans-Neptunian region.
Aims: In this paper we calculate the production of craters on the mid-sized Saturnian satelli…
Radio emission at the centre of the galaxy cluster Abell 3560: evidence for core sloshing?
Rossetti, M.; Giacintucci, S.; Venturi, T. +4 more
Context. We study the interplay between the radio emission associated with the dominant galaxy in clusters and the properties of the surrounding intracluster medium on the basis of its X-ray emission.
Aims: Previous radio observations of the galaxy cluster A 3560, located in the Shapley Concentration core, revealed complex radio emission asso…
The HIPPARCOS parallax for Polaris
van Leeuwen, F.
This Letter follows a recent claim that the Hipparcos parallax for Polaris could be too small by 2.5 mas. It examines in detail the Hipparcos epoch astrometric data for Polaris, as well as the viability of other observations that were put forward to support a larger parallax. The Hipparcos determination of the Polaris parallax is shown to be suffi…
Masses and age of the chemically peculiar double-lined binary χ Lupi
Ménard, F.; Beust, H.; Le Bouquin, J. -B. +3 more
Aims: We aim at measuring the stellar parameters of the two chemically peculiar components of the B9.5Vp HgMn + A2 Vm double-lined spectroscopic binary HD 141556 (χ Lup), whose period is 15.25 days.
Methods: We combined historical radial velocity measurements with new spatially resolved astrometric observations from PIONIER/VLTI to recon…
Discovery of a 168.8 s X-ray pulsar transiting in front of its Be companion star in the Large Magellanic Cloud
Pietsch, W.; Haberl, F.; Greiner, J. +5 more
Aims: We report the discovery of LXP 169, a new high-mass X-ray binary in the Large Magellanic Cloud. The optical counterpart has been identified and appears to exhibit an eclipsing light curve. We performed follow-up observations to clarify the eclipsing nature of the system.
Methods: Energy spectra and time series were extracted from t…
X-ray source population study of the starburst galaxy M 83 with XMM-Newton
Pietsch, W.; Haberl, F.; Ducci, L. +1 more
Aims: We present the results obtained from the analysis of three XMM-Newton observations of M 83. The aims of the paper are studying the X-ray source populations in M 83 and calculating the X-ray luminosity functions of X-ray binaries for different regions of the galaxy.
Methods: We detected 189 sources in the XMM-Newton field of view in…
Analogs of solid nanoparticles as precursors of aromatic hydrocarbons
Mutschke, H.; Jäger, C.; Gadallah, K. A. K.
Context. Aromatic =CH and C=C vibrational bands have been observed within shocked interstellar regions, indicating the presence of aromatic emission carriers such as PAHs, which may have been created from adjacent molecular cloud material by interaction with a shock front.
Aims: We investigate the evolution of the aromatic =CH and C=C vibrati…
Fundamental vibrational transitions of hydrogen chloride detected in CRL 2136
Menten, K. M.; Neufeld, D. A.; Geballe, T. R. +3 more
Aims: We would like to understand the chemistry of dense clouds and their hot cores more quantitatively by obtaining more complete knowledge of the chemical species present in them.
Methods: We have obtained high-resolution infrared absorption spectroscopy at 3-4 µm toward the bright infrared source CRL 2136.
Results: The fund…
The HIFI spectral survey of AFGL 2591 (CHESS). I. Highly excited linear rotor molecules in the high-mass protostellar envelope
Ceccarelli, C.; Pagani, L.; van der Tak, F. F. S. +2 more
Context. Linear rotor molecules such as CO, HCO+ and HCN are important probes of star-forming gas. For these species, temperatures of ≲ 50 K are sufficient to produce emission lines that are observable from the ground at (sub)millimeter wavelengths. Molecular gas in the environment of massive protostellar objects, however, is known to r…
A massive parsec-scale dust ring nebula around the yellow hypergiant Hen 3-1379
Hutsemékers, D.; Cox, N. L. J.; Vamvatira-Nakou, C.
On the basis of far-infrared images obtained by the Herschel Space Observatory, we report the discovery of a large and massive dust shell around the yellow hypergiant Hen 3-1379. The nebula appears as a detached ring of 1 pc diameter which contains 0.17 M⊙ of dust. We estimate the total gas mass to be 7 M⊙, ejected some 1.6 ×…