Search Publications
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 …
The population of early-type galaxies: how it evolves with time and how it differs from passive and late-type galaxies
Longhetti, M.; Gargiulo, A.; Saracco, P. +3 more
Aims: There are two aims to our analysis. On the one hand we are interested in addressing whether a sample of morphologically selected early-type galaxies (ETGs) differs from a sample of passive galaxies in terms of galaxy statistics. On the other hand we study how the relative abundance of galaxies, the number density, and, the stellar mass …
Four new X-ray-selected supernova remnants in the Large Magellanic Cloud
Pietsch, W.; Haberl, F.; Gruendl, R. A. +8 more
Aims: We present a detailed multi-wavelength study of four new supernova remnants (SNRs) in the Large Magellanic Cloud (LMC). The objects were identified as SNR candidates in X-ray observations performed during the survey of the LMC with XMM-Newton.
Methods: Data obained with XMM-Newton are used to investigate the morphological and spect…
Herschel/PACS observations of the 69 µm band of crystalline olivine around evolved stars
Waters, L. B. F. M.; Blommaert, J. A. D. L.; García-Lario, P. +15 more
Context. We present 48 Herschel/PACS spectra of evolved stars in the wavelength range of 67-72 µm. This wavelength range covers the 69 µm band of crystalline olivine (Mg2-2xFe(2x)SiO4). The width and wavelength position of this band are sensitive to the temperature and composition of the crystalline oli…