Search Publications
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 …
A multiwavelength investigation of the massive eclipsing binary Cygnus OB2 #5
Damerdji, Y.; Rauw, G.; Vreux, J. -M. +5 more
Context: The properties of the early-type binary
Aims: We have attempted to constrain the physical properties of the binary by collecting new optical and X-ray observations.
Methods: The optical light…
Benchmarking atomic data for astrophysics: Fe VIII EUV lines
Del Zanna, G.
The EUV spectrum of ion{Fe}{viii} is reviewed, using new solar observations from the Hinode EUV Imaging Spectrometer (EIS), together with older solar and laboratory data. The most up-to-date scattering calculations are benchmarked against these experimental data, with the use of a large atomic structure calculation. Once adjustments are made to th…
Mid-infrared imaging of 25 local AGN with VLT-VISIR
Gandhi, P.; Duschl, W. J.; Smette, A. +1 more
Context: High angular resolution N-band imaging is used to discern the torus of active galactic nuclei (AGN) from its environment in order to allow a comparison of its mid-infrared properties to the expectations of the unified scenario for AGN.
Aims: We present VLT-VISIR images of 25 low-redshift AGN of different Seyfert types, as well as N-ba…
Forward modelling to determine the observational signatures of propagating slow waves for TRACE, SoHO/CDS, and Hinode/EIS
Hood, A. W.; De Moortel, I.; Owen, N. R.
Context: The propagation and damping of slow MHD waves in the solar atmosphere are investigated by numerical simulations and forward modelling, with particular emphasis placed on waves with periodicities of the order of five minutes.
Aims: We extend a coronal model by adding an equilibrium temperature gradient allowing study of wave propagatio…