Search Publications
X-ray spectral study of hot gas in three clusters of galaxies
Kaastra, J. S.; de Plaa, J.; Costantini, E. +4 more
Aims: We studied the physical properties of three clusters of galaxies, selected from a BeppoSAX wide field camera (WFC) survey. These sources are identified as
The radio-loud active nucleus in the ``dark lens'' galaxy J1218+2953
Moór, A.; Frey, S.; Paragi, Z. +1 more
Context. There is a possibility that the optically unidentified radio source J1218+2953 may act as a gravitational lens, producing an optical arc ~4” away from the radio position. Until now, the nature of the lensing object has been uncertain since it is not detected in any waveband other than the radio. The estimated high mass-to-light ratio coul…
Adiabatic high degree modes of a rotating star. I. General features and real pressure modes
Fleck, B.; Schmitz, F.
Aims: The influence of the rotation of the Sun on non-radial p-modes with high wave numbers l is studied. To investigate and understand the basic properties of these modes, it is sufficient to consider only the outer layers of the Sun, which can be approximated by a plane layer with constant gravity.
Methods: We use a model with a smooth…
The outer atmospheric layers of the early M dwarf Gliese 1
Bessell, M. S.; Liebert, J.; Wehrse, R. +1 more
Using infrared and high-resolution optical observations of the M dwarf Gliese 1, we investigated the temperatures in the upper atmospheric layers of this star with low atmospheric activity. To fit the Hα and metal line profiles, the normal radiative equilibrium temperature decrease must be truncated at about log τ1.2µ≈-1.9 above w…
A scenario of planet erosion by coronal radiation (Corrigendum)
Eiroa, C.; Ribas, I.; Solano, E. +4 more
In the notes to Table 1, a unit conversion was incorrect. The text should read 1 MJ Gyr-1 = 6.02e+13 g s-1. As a consequence in the 3rd paragraph of Sect. 3, the mass loss taking place in τ Boo b should be dot M_X = 0.011 MJ Gyr-1 for ρ = 1 g cm-3, or dot M_X = 3.4 M⊕ Gyr…
The mid-UV population of the nucleus and the bulk of the post-merger NGC 3610
Buson, L. M.
Context. The very center (r ≪ re) of NGC 3610, a clearly disturbed giant elliptical that is generally assumed to be a post-merger remnant, appears dominated in the mid-UV (2500-3200 Å spectral region) by a stellar population that is markedly different from that dominating the bulk of its stellar body.
Aims: We make use of the mid-U…
The CoRoT satellite in flight: description and performance
Guterman, P.; Auvergne, M.; Jorda, L. +107 more
Context: CoRoT is a space telescope dedicated to stellar seismology and the search for extrasolar planets. The mission is led by the CNES in association with French laboratories and has a large international participation. The European Space Agency (ESA), Austria, Belgium, and Germany contribute to the payload, and Spain and Brazil contribute to t…
Galaxy cluster X-ray luminosity scaling relations from a representative local sample (REXCESS)
Böhringer, H.; Arnaud, M.; Pratt, G. W. +1 more
We examine the X-ray luminosity scaling relations of 31 nearby galaxy clusters from the Representative XMM-Newton Cluster Structure Survey (REXCESS). The objects are selected only in X-ray luminosity, optimally sampling the cluster luminosity function. Temperatures range from 2 to 9 keV, and there is no bias toward any particular morphological typ…
The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics
Holmberg, J.; Nordström, B.; Andersen, J.
Context: Ages, chemical compositions, velocity vectors, and Galactic orbits for stars in the solar neighbourhood are fundamental test data for models of Galactic evolution. The Geneva-Copenhagen Survey of the Solar Neighbourhood (Nordström et al. 2004; GCS), a magnitude-complete, kinematically unbiased sample of 16 682 nearby F and G dwarfs, is th…
Transiting exoplanets from the CoRoT space mission. VIII. CoRoT-7b: the first super-Earth with measured radius
Mazeh, T.; Guterman, P.; Aigrain, S. +158 more
Aims: We report the discovery of very shallow (Δ F/F ≈ 3.4× 10-4), periodic dips in the light curve of an active V = 11.7 G9V star observed by the CoRoT satellite, which we interpret as caused by a transiting companion. We describe the 3-colour CoRoT data and complementary ground-based observations that support the planetary nature of t…