1,035 datasets found

Keywords: astrophysical processes

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  • VRi light curves of the lensed QSO HE 0435-1223

    We present VRi photometric observations of the quadruply imaged quasar HE0435-1223, carried out with the Danish 1.54m telescope at the La Silla Observatory. Our aim was to...
  • Rotation measures in the fourth Galactic quadrant

    We have re-examined the published rotation measures (RMs) of extragalactic point sources and pulsars with |b|<3{deg} to study the magnetic field in the fourth Galactic...
  • GRS 1915+105 timing analysis

    GRS 1915+105 was observed by BeppoSAX for about 10 days in October 2000. For about 80% of the time, the source was in the variability class rho, characterised by a series of...
  • Abundances of microlensed stars in the Bulge

    We perform a detailed elemental abundance analysis of dwarf stars in the Galactic bulge, based on high-resolution spectra that were obtained while the stars were optically...
  • V1118 Ori UBVRIJHK outburst light curves

    The accretion history of low-mass young stars is not smooth but shows spikes of accretion that can last from months and years to decades and centuries. Observations of young...
  • Magnetic fields in white dwarfs

    A large number of magnetic white dwarfs discovered in the SDSS have so far only been analyzed by visual comparison of the observations with relatively simple models of the...
  • Photometric masses of early-type lens galaxies

    The largest spectroscopically selected sample of strong gravitational lens systems presented and analyzed to date is that of the Sloan Lens ACS (SLACS) survey. For the 57...
  • Abundances of microlensed dwarf and subgiant stars

    We present a detailed elemental abundance analysis of OGLE-2008-BLG-209S, the source star of a new microlensing event towards the Bulge, for which we obtained a high-resolution...
  • Pulsar Timing for Fermi Gamma-ray Space Telescope

    We describe a comprehensive pulsar monitoring campaign for the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The detection and study of...
  • Time delays and H0 from WFI J2033-4723

    Gravitationally lensed quasars can be used to map the mass distribution in lensing galaxies and to estimate the Hubble constant H0 by measuring the time delays between the...
  • Pulsar subpulse modulation properties at 92cm

    A large sample of pulsars has been observed to study their subpulse modulation at an observing wavelength (when achievable) of both 21 and 92 cm using the Westerbork Synthesis...
  • Bulge Microlensing Events

    Microlensing events have been observed regularly by surveys such as MACHO, OGLE and MOA. They offer an excellent way to probe the galactic structure, kinematics and stellar...
  • H{alpha} equivalent widths of 36 Lyn (HD 79158)

    This paper reports the photospheric, magnetic and circumstellar gas characteristics of the magnetic B8p star 36 Lyncis (HD 79158). Using archival data and new polarised and...
  • Obs. of 2 Unidentified Gamma-ray Sources

    The systematic X-ray and optical coverage of low-latitude unidentified gamma-ray sources, aiming at sources with high X-ray/optical flux ratio, seems one of the most promising...
  • Variability of 5 gravitationally lensed QSOs

    We have searched for microlensing variability in the light curves of five gravitationally lensed quasars with well-determined time delays: SBS 1520+530, FBQ 0951+2635, RX...
  • EROS-2 microlensing parameters

    We present a new EROS-2 measurement of the microlensing optical depth toward the Galactic Bulge. Light curves of 5.6x10^6^ clump-giant stars distributed over 66deg^2^ of the...
  • Temporal variability of Cygnus X-1

    We present results of fitting power density spectra from archived Rossi X-ray Timing Explorer (RXTE) data of the source Cygnus X-1. The data cover the observations of the source...
  • Near-IR photometry of PMS stars in rho Oph

    The aim of this paper is to provide a measurement of the mass accretion rate in a large, complete sample of objects in the core of the star forming region rho Oph. The sample...
  • Evolutionary state of magnetic CP stars

    The photospheres of about 5-10% of the upper main sequence stars exhibit remarkable chemical anomalies. Many of these chemically peculiar (CP) stars have a global magnetic...
  • Pulsar subpulse modulation properties at 21cm

    We present the results of a systematic, unbiased search for subpulse modulation of 187 pulsars performed with the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands...
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