Search Publications
X-ray flares on the UV Ceti-type star CC Eridani: a ``peculiar'' time-evolution of spectral parameters
Micela, G.; Reale, F.; Pillitteri, I. +3 more
Context: Weak flares are supposed to be an important heating agent of the outer layers of stellar atmospheres. However, due to instrumental limitations, only large X-ray flares have been studied in detail until now.
Aims: We used an XMM-Newton observation of the very active BY-Dra type binary star CC Eri in order to investigate the properties …
A benchmark event sequence for mass ejection onset studies. A flare associated CME with coronal dimming, ascending pre-flare loops and a transient cool loop
Harrison, R. A.; Bewsher, D.
Aims:In this study, we report on the spectroscopic observations of a particularly well-observed flare and coronal mass ejection (CME) event sequence which we feel can be used as a benchmark study for CME onsets.
Methods: Specifically, we report on a set of extreme-ultraviolet (EUV) spectroscopic observations using the Solar and Heliospheric Ob…
Gas and dust spectra of the D' type symbiotic star HD 330036
Ciroi, S.; Rafanelli, P.; Angeloni, R. +1 more
Aims:We present a comprehensive and self-consistent modelling of the D' type symbiotic star (SS) HD 330036 from radio to UV.
Methods: Within a colliding-wind scenario, we analyse the continuum, line, and dust spectra by means of SUMA, a code that simulates the physical conditions of an emitting gaseous cloud under the coupled effect of ionisat…
The q = 1 peak in the mass-ratios for Hipparcos visual binaries
Söderhjelm, S.
Aims:The magnitude differences for Hipparcos visual binaries give important information about the upper part of their mass-ratio distribution, and in previous studies, the author found a narrow peak at q=1 This excess of equal-mass, wide pairs has not been confirmed in other studies, and the present work aims to strengthen the Hipparcos results. <…
Distant galaxy clusters in the COSMOS field found by HIROCS
Wolf, C.; Röser, H. -J.; Zatloukal, M. +2 more
We present the first high-redshift gal axy cluster candidate sample from the HIROCS survey found in the COSMOS field. It results from a combination of public COSMOS with proprietary H-band data on a 0.66 square° part of the COSMOS field and comprises 12 candidates in the redshift range 1.23 ≤ z ≤ 1.55. We find an increasing fraction of blue cluste…
Coronal transients and metric type II radio bursts. II. Accelerations at low coronal heights
Mancuso, S.
In the companion Paper I, Mancuso & Raymond (2004) investigated the relationship between type ii and coronal mass ejection (CME) activity for a sample of twenty-nine CME/shock events that occurred between March and December 1999. Most of the events appeared to lead the type ii emission locations by several minutes and the two sets of speeds we…
Infrared study of the southern Galactic star-forming region associated with IRAS 14416-5937
Ojha, D. K.; Vig, S.; Ghosh, S. K. +1 more
Aims:Our goal was to carry out an infrared study of the southern Galactic massive star-forming region associated with IRAS 14416-5937.
Methods: This star-forming region has been mapped simultaneously in two far infrared bands at ~150 and 210 µm, using the TIFR 1-m balloon borne telescope with ~1' angular resolution. We have used 2MASS JH…
A massive protostellar core with an infalling envelope
Henning, Th.; Krause, O.; Birkmann, S. M. +3 more
Context: Due to the short timescales involved and observational difficulties, our knowledge of the earliest phases of massive star formation remains incomplete.
Aims: We aim to explore the physical conditions during the initial phases of high-mass star formation and to detect a genuine massive (mass M > 8 M_⊙) protostar at an early evolutio…
Strong lensing analysis of the cluster RCS0224-0002 at z = 0.77
Tozzi, P.; Rosati, P.; Lombardi, M. +2 more
Aims:We present a detailed mass reconstruction of the cluster RCS0224-0002 at z=0.773 from the strong lensing features observed with HST/WFPC2.
Methods: The mass profile is reconstructed using a parametric approach. We introduce a novel method to fit extended multiple images based on the Modified Hausdorff Distance between observed arcs and th…
Plasma motions in a short-lived filament related to a magnetic flux cancellation
Romano, P.; Spadaro, D.; Contarino, L. +2 more
Context: In recent years the mechanisms responsible for filament formation and evolution have been investigated by many authors. In particular, the role played by the processes of magnetic flux cancellation in building up or destroying filaments is still a matter of debate.
Aims: In this paper we analyze the evolution of an active region filam…