Search Publications
Radiation-driven winds of hot luminous stars. XV. Constraints on the mass-luminosity relation of central stars of planetary nebulae
Pauldrach, A. W. A.; Hoffmann, T. L.; Méndez, R. H.
We present a new model atmosphere analysis of nine central stars of planetary nebulae. This study is based on a new generation of realistic stellar model atmospheres for hot stars; state-of-the-art, hydrodynamically consistent, spherically symmetric model atmospheres that have been shown to correctly reproduce the observed UV spectra of massive Po…
XMM-Newton observation of the relaxed cluster A478: Gas and dark matter distribution from 0.01R200 to 0.5R200
de Plaa, J.; Arnaud, M.; Pointecouteau, E. +1 more
We present an XMM-Newton mosaic observation of the hot (kT∼6.5 keV) and nearby (z=0.0881) relaxed cluster of galaxies A478. We derive precise gas density, gas temperature, gas mass and total mass profiles up to 12 arcmin (about half of the virial radius R200). The gas density profile is highly peaked towards the center and the surface b…
Tests of stellar model atmospheres by optical interferometry. VLTI/VINCI limb-darkening measurements of the M4 giant ψ Phe
Kervella, P.; Wittkowski, M.; Aufdenberg, J. P.
We present K-band interferometric measurements of the limb-darkened (LD) intensity profile of the M 4 giant star ψ Phoenicis obtained with the Very Large Telescope Interferometer (VLTI) and its commissioning instrument VINCI. High-precision squared visibility amplitudes in the second lobe of the visibility function were obtained employing two 8.2 …
The late-time light curve of the type Ia supernova 2000cx
Sollerman, J.; Lundqvist, P.; Spyromilio, J. +10 more
We have conducted a systematic and comprehensive monitoring programme of the type Ia supernova 2000cx at late phases using the VLT and HST. The VLT observations cover phases 360 to 480 days past maximum brightness and include photometry in the BVRIJH bands, together with a single epoch in each of U and K_s. While the optical bands decay by about 1…
Structure and kinematics of candidatedouble-barred galaxies
Moiseev, A. V.; Chavushyan, V. H.; Valdés, J. R.
Results of optical and NIR spectral and photometric observations of a sample of candidate double-barred galaxies are presented. Velocity fields and velocity dispersion maps of stars and ionized gas, continuum and emission-line images were constructed from integral-field spectroscopy observations carried out at the 6 m telescope (BTA) of SAO RAS, w…
The sizes and kinematic structure of absorption systems towards the lensed quasar APM08279+5255
Petitjean, P.; Pettini, M.; Lewis, G. F. +4 more
We have obtained spatially resolved spectra of the z_em=3.911 triply imaged QSO APM08279+5255 using the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST). We study the line of sight equivalent width (EW) differences and velocity shear of high and low ionization absorbers (including a damped Lyman alpha [DLA] sys…
The isolated neutron star X-ray pulsars RX J0420.0-5022 and RX J0806.4-4123 : New X-ray and optical observations
Haberl, F.; Motch, C.; Gänsicke, B. T. +6 more
We report on the analysis of new X-ray data obtained with XMM-Newton and Chandra from two ROSAT-discovered X-ray dim isolated neutron stars (XDINs).
ISO observations of the Galactic center interstellar medium. Neutral gas and dust
Rodríguez-Fernández, N. J.; Martín-Pintado, J.; Fuente, A. +1 more
The 500 central pc of the Galaxy (hereafter GC) exhibit a widespread gas component with a kinetic temperature of 100-200 K. The bulk of this gas is not associated to the well-known thermal radio continuum or far infrared sources like Sgr A or Sgr B. How this gas is heated has been a longstanding problem. With the aim of studying the thermal balanc…
ISOCAM survey and dust models of 3CR radio galaxies and quasars
Siebenmorgen, R.; Haas, M.; Freudling, W. +1 more
We present a survey of all 3CR sources imaged with ISOCAM onboard the Infrared Space Observatory (ISO). The sample consists mostly of radio-loud active galactic nuclei (AGN). For each source, we present spatially integrated mid-infrared (MIR, 5-18 µm) fluxes measured from newly calibrated ISOCAM images. In total, we detected 68 objects of th…
Transition region small-scale dynamics as seen by SUMER on SOHO
Doyle, J. G.; Madjarska, M. S.; Teriaca, L. +2 more
High spectral, spatial and temporal resolution UV observations of the quiet Sun transition region show a highly structured and dynamical environment where transient supersonic flows are commonly observed. Strongly non-Gaussian line profiles are the spectral signatures of these flows and are known in the literature as explosive events. In this pape…