Search Publications
New estimates of the gamma-ray line emission of the Cygnus region from INTEGRAL/SPI observations
Meynet, G.; Knödlseder, J.; Diehl, R. +1 more
Context: The Cygnus region harbours a huge complex of massive stars at a distance of 1.0-2.0 kpc from us. About 170 O stars are distributed over several OB associations, among which the Cyg OB2 cluster is by far the largest with about 100-120 O stars. As a consequence of their successive nuclear-burning episodes, these massive stars inject large q…
Observation of bipolar moving magnetic features streaming out from a naked spot
Guglielmino, S. L.; Romano, P.; Zuccarello, F. +5 more
Context: Mechanisms responsible for active-region formation, evolution, and decay have been investigated by many authors and several common features have been identified. In particular, a key element in the dispersal of the magnetic field seems to be the presence of magnetic elements, called moving magnetic features (MMFs).
Aims: We analyze th…
Planetary transit candidates in Corot-IRa01 field
Aigrain, S.; Alonso, R.; Barge, P. +35 more
Context: CoRoT is a pioneering space mission devoted to the analysis of stellar variability and the photometric detection of extrasolar planets.
Aims: We present the list of planetary transit candidates detected in the first field observed by CoRoT, IRa01, the initial run toward the Galactic anticenter, which lasted for 60 days.
Methods: W…
Imaging of star clusters in unperturbed spiral galaxies with the Advanced Camera for Surveys. II. A comparison of star cluster systems in five late type spirals
Larsen, S. S.; Kissler-Patig, M.; Richtler, T. +2 more
Aims: Our goal is to investigate the formation of star clusters in relatively unperturbed environments. To do this, we studied the five nearby spiral galaxies: NGC 45, NGC 1313, NGC 4395, NGC 5236, and NGC 7793.
Methods: We obtained images of the galaxies and their star cluster systems in {UBVI} using the Advanced Camera for Surveys (ACS) and …
The young stellar population of IC 1613. I. A new catalogue of OB associations
Herrero, A.; Monelli, M.; Corral, L. J. +4 more
Context: Determining the parameters of massive stars is crucial to understand many processes in galaxies and the Universe, since these objects are important sources of ionization, chemical enrichment and momentum. 10m class telescopes enable us to perform detailed quantitative spectroscopic analyses of massive stars in other galaxies, sampling are…
Discovery of an eccentric 30 day period in the supergiant X-ray binary SAX J1818.6-1703 with INTEGRAL
Chaty, S.; Zurita Heras, J. A.
Context: SAX J1818.6-1703 is a flaring transient X-ray source serendipitously discovered by BeppoSAX in 1998 during an observation of the Galactic centre. The source was identified as a high-mass X-ray binary with an OB supergiant companion (SGXB). Displaying short and bright flares and an unusually very low quiescent level implying an intensity d…
A new method of determining distances to dark globules. The distance to B 335
Olofsson, G.; Olofsson, S.
Context: The distance to an isolated dark globule is often unknown and yet crucial for understanding its properties, in particular its mass. A new approach to this problem is discussed
Aims: The purpose of the present paper is to investigate how well the distances of more or less reddened field stars can be determined by using multi-colour ima…
Coronal hole boundaries evolution at small scales. I. EIT 195 Å and TRACE 171 Å view
Madjarska, M. S.; Wiegelmann, T.
Aims: We aim to study the small-scale evolution at the boundaries of an equatorial coronal hole connected with a channel of open magnetic flux to the polar region and an “isolated” one in the extreme-ultraviolet spectral range. We determine the spatial and temporal scale of these changes.
Methods: Imager data from TRACE in the Fe ix/x 171 Å pa…
Planetary companion candidates around the K giant stars 42 Draconis and HD 139 357
Guenther, E. W.; Pasquini, L.; Hatzes, A. P. +3 more
Context: For the past 3 years we have been monitoring 62 K giant stars using precise stellar radial velocity (RV) measurements with the 2 m Alfred Jensch Telescope of the Thüringer Landessternwarte Tautenburg (TLS).
Aims: To probe the dependence of planet formation on stellar mass by finding planets around intermediate-mass giant stars.
Me…
Interstellar extinction and long-period variables in the Galactic centre
Ganesh, S.; Glass, I. S.; Schultheis, M. +4 more
Aims: We derive a new map of the interstellar extinction near the Galactic Centre (GC), extending to much higher values of AV than previously available, and use the results obtained to better characterise the long-period variable star population of the region.
Methods: We take the Spitzer IRAC catalogue of GC point sources (Ramírez …