Search Publications
UV flux distributions of γ Doradus stars
Caffau, E.; Gerbaldi, M.; Faraggiana, R.
Context: It seems that the recently identified class of pulsating stars, the γ Dor type-variables, includes objects with different metal abundances and a large percentage of binaries.
Aims: We looked for indicators of metal abundance peculiarities and stellar binarity in a sample of 40 confirmed γ Dor stars.
Methods: Absolute magnitudes fr…
Radio burst from converging separatrices
Mann, G.; Aurass, H.; Rausche, G.
Context: In a previous paper on the X17 flare October 28, 2003, we found, among other radio flare sources, one displaced at ≈0.2 R_⊙ north of the flaring AR 10486, away from the main Hα and hard X-ray flare emission. The source came to our attention due to its timing, its spatial displacement from the flaring active region, and due to the behavior…
Optical detection of the radio supernova SN 2000ft in the circumnuclear region of the luminous infrared galaxy NGC 7469
Panagia, N.; Colina, L.; Díaz-Santos, T. +4 more
Context: (Ultra)Luminous Infrared Galaxies (ULIRGs) produce massive stars in large quantities in their central starburst regions. The expected rate of supernova explosions is, on average, about one per year. Detection of these supernovae in the expected numbers has proven elusive so far.
Aims: Illustrate the general benefits and limitations of…
Spectral variability analysis of an XMM-Newton observation of Ark 564
Papadakis, I. E.; Brinkmann, W.; Raeth, C.
Context: We present a spectral variability analysis of the X-ray emission of the Narrow Line Seyfert 1 galaxy Ark 564 using the data from a ~100 ks XMM-Newton observation.
Aims: Taking advantage of the high sensitivity of this long observation and the simple spectral shape of Ark 564, we determine accurately the spectral variability patterns i…
Cygnus X-3 transition from the ultrasoft to the hard state
Gehrels, N.; von Kienlin, A.; De Cesare, G. +8 more
Aims:The nature of Cygnus X-3 is still not understood well. This binary system might host a black hole or a neutron star. Recent observations by INTEGRAL have shown that Cygnus X-3 was again in an extremely ultrasoft state. Here we present our analysis of the transition from the ultrasoft state, dominated by blackbody radiation at soft X-rays plus…
Multicolour CCD measurements of visual double and multiple stars. III
Strigachev, A.; Lampens, P.; Duval, D.
Context: Recent CCD observations were performed in the period 1998-2004 for a large sample of visual double and multiple stars selected from the Hipparcos Catalogue and/or from the Gliese Catalogue of Nearby Stars.
Aims: Accurate astrometric and photometric data allowing us to characterise the individual components are provided. These data are…
A compact dust shell in the symbiotic system HM Sagittae
Cruzalèbes, P.; Chesneau, O.; Sacuto, S. +1 more
Aims:We present high spatial resolution observations of the mid-infrared core of the dusty symbiotic system
Methods: The MIDI interferometer was used with the VLT Unit Telescopes and Auxiliary Telescopes providing baselines oriented from PA = 42° to 105°. The MIDI visibilities are compared with the ones predicted in …
XMM-Newton observation of the classical T Tauri star SU Aurigae and the surrounding field
Audard, M.; Pallavicini, R.; Franciosini, E. +1 more
Aims: We investigate the properties of the X-ray emitting plasma of the classical T Tauri star SU Aurigae and of other sources in the field of view.
Methods: We use XMM-Newton to obtain a high-resolution RGS spectrum of SU Aur as well as EPIC imaging data and low-resolution spectra of the star and of other X-ray sources in the surrounding fiel…
Low surface brightness galaxies around the HDF-S. I. Object extraction and photometric results
Bomans, D. J.; Dettmar, R. -J.; Pohlen, M. +1 more
Aims:The aim of this study is to extend the parameter space for Low Surface Brightness (LSB) galaxies to reach lower central surface brightnesses, smaller sizes and higher number densities.
Methods: This study reports on photometric results of a search for LSB galaxies in a 0.76 deg2 field centered on the Hubble Deep Field-South (HD…
Updated ephemeris of Phoebe, ninth satellite of Saturn
Emelyanov, N. V.
Context: The theoretical model of natural satellite motion may need improvement each time new observations of a considerable amount are accumulated over a significant time interval.
Aims: The goal of our work is to elaborate the ephemeris of Phoebe based on all ground-based observations available to date and readily accessible for any user via…