Search Publications
Direct imaging of the young spectroscopic binary HD 160934
Henning, T.; Brandner, W.; Hormuth, F. +2 more
Context: Members of nearby moving groups are promising candidates for the detection of stellar or substellar companions by direct imaging. Mass estimates and magnitude measurements of detected companions to young stars are valuable input data to facilitate the refinement of existing pre-main-sequence stellar models. In this paper we report on our …
The variable X-ray light curve of GRB 050713A: the case of refreshed shocks
Covino, S.; Campana, S.; Tagliaferri, G. +21 more
We present a detailed study of the spectral and temporal properties of the X-ray and optical emission of GRB050713a up to 0.5 day after the main Gamma Ray Burst (GRB) event. The X-ray light curve exhibits large amplitude variations with several rebrightenings superposed on the underlying three-segment broken power-law that is often seen in Swift G…
The XMM-Newton/INTEGRAL monitoring campaign of IGR J16318-4848
Guainazzi, M.; Jiménez-Bailón, E.; Rodriguez, J. +5 more
Context: IGR J16318-4848 is the prototype and one of the more extreme examples of the new class of highly obscured Galactic X-ray sources discovered by INTEGRAL. A monitoring campaign on this source has been carried out using XMM-Newton and INTEGRAL, consisting of three simultaneous observations performed in February, March and August 2004.
Ai…
Magnetic properties of flare-CME productive active regions and CME speed
Zhang, H. Q.; Guo, J.; Chumak, O. V.
Aims:We study the properties of magnetic field of flare-coronal-mass-ejection (flare-CME) productive active regions and their statistic correlations with CME speed.
Methods: We used a sample of 86 flare-CMEs in 55 solar active regions. Four measures, including the tilt angle (Tilt), total flux (Ft), length of the strong-field and strong-gradie…
The secrets of T Pyxidis. I. UV observations
Selvelli, P.; Gilmozzi, R.
Aims:We study the UV spectral behavior of the recurrent nova T Pyx during 16 years of <sl>IUE observations.</sl>
Methods: We examined both the <sl>IUE line-by-line images and the extracted spectra in order to understand the reality and the origin of the observed spectral variations. We compare different extraction methods and…
ISO far-infrared observations of the high-latitude cloud L1642 . II. Correlated variations of far-infrared emissivity and temperature of "classical large" dust particles
Juvela, M.; Lemke, D.; Russeil, D. +2 more
Aims:Our aim is to compare the infrared properties of big, "classical" dust grains with visual extinction in the cloud
Methods: The far-infrared properties of dust are based on large-scale 100 µm and 200 &…
On the nature of optical nuclei in FR I radio-galaxies from ACS/HST imaging polarimetry
Capetti, A.; Sparks, W. B.; Chiaberge, M. +4 more
We obtained optical imaging polarimetry with the ACS/HRC aboard the HST of the 9 closest radio-galaxies in the 3C catalogue with an FR I morphology. The nuclear sources seen in direct HST images in these galaxies are found to be highly polarized with levels in the range ~2-11% with a median value of 7%. We discuss the different mechanisms that pro…
XMM-Newton and INTEGRAL observations of the black hole candidate XTE J1817-330
Haberl, F.; Greiner, J.; Sala, G. +2 more
Aims:The galactic black hole candidate
An in-depth study of the pre-polar candidate WX Leonis Minoris
Gänsicke, B. T.; Schwope, A. D.; Vogel, J.
Optical photometry, spectroscopy, and XMM-Newton ultraviolet and X-ray observations with full phase coverage are used for an in-depth study of WX LMi, a system formerly termed a low-accretion rate polar. We find a constant low-mass accretion rate, dot{M} ∼ 1.5 × 10-13 M_⊙ yr-1, a peculiar accretion geometry with one spot not …
The acceleration characteristics of solar energetic particles in the 2000 July 14 event
Li, C.; Dai, Y.; Fang, C. +2 more
Aims:In large gradual solar energetic particle (SEP) events, especially the ground-level enhancement (GLE) events, where and how energetic particles are accelerated is still a problem.
Methods: By using imaging data from TRACE, Yohkoh/HXT, SOHO/MDI and SOHO/EIT, along with the data from the GOES, Apatity NM, and SOHO/LASCO CME catalog, the evo…