Search Publications
Cassini/Huygens flyby of the Jovian system
Lebreton, Jean-Pierre; Matson, Dennis L.; Spilker, Linda J. +2 more
This is an introduction to the series of 15 papers that follow. These report scientific results from the fields-and-particles instruments on Cassini/Huygens. For these works, their data acquisition started as early as 16 months before the passage by Jupiter and, for some, continued up to the approach to Saturn. The flyby of Jupiter provided a grav…
Multi-Wavelength Analysis of the 29 September 2002 M2.6/2N Flare
Dzifčáková, Elena; Karlický, Marian; Kulinová, Alena +1 more
Using TRACE EUV 171 Å line, Hα line, Zürich radio, RHESSI, and HXRS observations the 29 September 2002 flare (M2.6), which occurred in AR NOAA 0134, was analyzed. Flaring structures were compared with a potential magnetic field model (field lines and quasi-separatrix layers) made from SOHO/MDI full-disk magnetogram. Series of high-resolution SOHO/…
Radio and multiwavelength evidence of coronal loop eruption in a flare-coronal mass ejection event on 15 April 1998
Huang, Guang-Li
A typical flare-coronal mass ejection (CME) event is studied at the initial time and position of the flare and CME. The photospheric magnetic configuration consists of two main polarities (dipolar structure) with some emerged new polarities, similar to a quadrupolar structure, during the event. The coronal loops in soft X-ray and EUV images show t…
The Status of ROSAT X-ray Active Young Stars toward Taurus-Auriga
Li, Jin-Zeng
We present an astrometric study of the candidates of T Tauri stars (TTS) and non-TTS X-ray sources around Tau-Aur, based on the Hipparcos Catalogue and the ACT Reference Catalogue. The ROSAT selected X-ray sources are found to be a mixed population. A few of them are associated with the Tau-Aur or Orion Star Forming Regions (SFR). Some, with dista…
Accretion Processes in Mira AB
Raymond, J. C.; Marengo, M.; Karovska, M. +3 more
The Mira AB interacting binary provides an ideal laboratory for studying mass loss and accretion processes in systems containing an AGB star and a compact accretor, because its components have been resolved and can be studied individually. We present here results from our long term study of accretion processes in this system. These include recent …
A ULX in NGC 4559: a ``mini-cartwheel'' scenario?
Soria, R.; Cropper, M. S.; Pakull, M. W.
We have studied the peculiar environment around a ULX in NGC 4559 (with L[x] ≈ 2×1040 erg s-1 and M[BH] ≳ 50M⊙). The X-ray source is located near the rim of a young (age < 30 Myr), large (diameter ≈ 700 pc) ring-like star forming complex possibly triggered by the impact of a dwarf satellite galaxy through the gas-rich oute…
X-ray emission of young SN Ia remnants as a probe for an explosion model
Lundqvist, P.; Sorokina, E. I.; Blinnikov, S. I. +1 more
We present results of hydrodynamical simulations of young supernova remnants. To model the ejecta, we use several models (discussed in the literature) of type Ia supernova explosions with different abundances. Our hydro models are one-dimensional and spherically symmetrical, but they take into account ionization kinetics with all important process…
Solar Neighbourhood Age-Metallicity Relation Based on Hipparcos Data
Ibukiyama, Akihiko
We derive age-metallicity relations (AMRs) and orbits for the 1658 solar neighbourhood stars for which accurate distances are measured by the Hipparcos satellite. The sample comprises 1382 thin disk stars, 229 thick disk stars, and 47 halo stars according to their orbital parameters. We find a considerable scatter for thin disk AMRs along the one-…
The first XMM-Newton study of two Narrow-Line Seyfert 1 galaxies discovered in the Sloan Digital Sky Survey
Ponti, G.; Grandi, P.; Foschini, L. +6 more
The Early Data Release of the Sloan Digital Sky Survey (SDSS) contains 150 Narrow-Line Seyfert 1 (NLS1) galaxies, most of them previously unknown. We present here the study of the X-ray emission from two of these active galaxies (SDSS J030639.57+000343.2 and SDSS J141519.50-003021.6), based upon XMM-Newton observations. The spectral and timing cha…
A new mass-ratio for the X-ray binary X2127+119 in M 15?
Charles, P. A.; Naylor, T.; Ioannou, Z. +1 more
The luminous low-mass X-ray binary X2127+119 in the core of the globular cluster M 15 (NGC 7078), which has an orbital period of 17 hours, has long been assumed to contain a donor star evolving off the main sequence, with a mass of 0.8 M⊙space (the main-sequence turn-off mass for M 15). We present orbital-phase-resolved spectroscopy of …