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Large-scale environments of binary AGB stars probed by Herschel. II. Two companions interacting with the wind of π1 Gruis
Cruzalèbes, P.; Jorissen, A.; Pourbaix, D. +12 more
Context. The Mass loss of Evolved StarS (MESS) sample observed with PACS on board the Herschel Space Observatory revealed that several asymptotic giant branch (AGB) stars are surrounded by an asymmetric circumstellar envelope (CSE) whose morphology is most likely caused by the interaction with a stellar companion. The evolution of AGB stars in bin…
Searching for faint companions with VLTI/PIONIER. II. 92 main sequence stars from the Exozodi survey
Absil, O.; Augereau, J. -C.; Ertel, S. +6 more
Context. The Exozodi survey aims to determine the occurrence rate of bright exozodiacal discs around nearby main sequence stars using infrared interferometry. Although the Exozodi survey targets have been carefully selected to avoid the presence of binary stars, the results of this survey can still be biased by the presence of unidentified stellar…
GROND coverage of the main peak of gamma-ray burst 130925A
van Eerten, H.; Greiner, J.; Hurley, K. +23 more
Aims: Prompt or early optical emission in gamma-ray bursts (GRBs) is notoriously difficult to measure, and observations of the dozen cases show a large variety of properties. Yet, such early emission promises to help us achieve a better understanding of the GRB emission process(es).
Methods: We performed dedicated observations of the ult…
CoRoT 105906206: a short-period and totally eclipsing binary with a δ Scuti type pulsator
Gandolfi, D.; Hatzes, A. P.; Lehmann, H. +2 more
Aims: Eclipsing binary systems with pulsating components allow determination of several physical parameters of the stars, such as mass and radius, that can be used to constrain the modeling of stellar interiors and evolution when combined with the pulsation properties. We present the results of the study of CoRoT 105906206, an eclipsing binar…
Globular clusters of NGC 3115 in the near-infrared. Demonstrating the correctness of two opposing scenarios
Chies-Santos, Ana L.; Blakeslee, John P.; Kuntschner, Harald +4 more
We combined new near-infrared VLT/HAWK-I data of the globular clusters (GCs) in the isolated edge-on S0 galaxy
Stellar laboratories. II. New Zn iv and Zn v oscillator strengths and their validation in the hot white dwarfs G191-B2B and RE 0503-289
Rauch, T.; Werner, K.; Kruk, J. W. +1 more
Context. For the spectral analysis of high-resolution and high-signal-to-noise (S/N) spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These are strongly dependent on the reliability of the atomic data that is used for their calculation. In a recent analysis of the ultraviolet (UV) s…
Water in low-mass star-forming regions with Herschel. The link between water gas and ice in protostellar envelopes
van Dishoeck, E. F.; Walsh, C.; Kristensen, L. E. +4 more
Aims: Our aim is to determine the critical parameters in water chemistry and the contribution of water to the oxygen budget by observing and modelling water gas and ice for a sample of eleven low-mass protostars, for which both forms of water have been observed.
Methods: A simplified chemistry network, which is benchmarked against more s…
The chromosphere above sunspots at millimeter wavelengths
Solanki, S. K.; White, S. M.; Loukitcheva, M.
Aims: The aim of this paper is to demonstrate that millimeter wave data can be used to distinguish between various atmospheric models of sunspots, whose temperature structure in the upper photosphere and chromosphere has been the source of some controversy.
Methods: We use observations of the temperature contrast (relative to the quiet S…
Release timescales of solar energetic particles in the low corona
Vainio, R.; Valtonen, E.; Klein, K. -L. +14 more
Aims: We present a systematic study of the timing and duration of the release processes of near-relativistic (NR; >50 keV) electrons in the low corona.
Methods: We analyze seven well-observed events using in situ measurements by both the ACE and Wind spacecraft and context electromagnetic observations in soft X-rays, radio, hard X-ray…
The spectral catalogue of INTEGRAL gamma-ray bursts. results of the joint IBIS/SPI spectral analysis
Götz, D.; Bošnjak, Ž.; Bouchet, L. +2 more
We present the updated INTEGRAL catalogue of gamma-ray bursts (GRBs) observed between December 2002 and February 2012. The catalogue contains the spectral parameters for 59 GRBs localized by the INTEGRAL Burst Alert System (IBAS). We used the data from the two main instruments on board the INTEGRAL satellite: the spectrometer SPI (SPectrometer on …