Search Publications
Evidence of unrelaxed IGM around IC 1262
Pietsch, W.; Wolter, A.; Breitschwerdt, D. +2 more
Aims:A peculiar morphology of the hot gas was discovered at the center of
Methods: We have exploited the high resolution and sensitivity of Chandra's ACIS-S to invest…
Accurate masses of low mass stars GJ 765.2AB (0.83 M⊙ + 0.76 M⊙)
Weigelt, G.; Schertl, D.; Ségransan, D. +10 more
Context: Because of the lack of precise masses, the coverage of the main-sequence empirical mass-luminosity relation for stars in the mass range from 0.6 M⊙ to 0.9 M⊙ is incomplete. The nearby K-type visual and spectroscopic binary GJ 765.2 = MLR 224 is a good candidate for new reliable points in this significant part of the …
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…