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Tracking Large-Scale Propagating Coronal Wave Fronts (EIT Waves) using Automated Methods
Wills-Davey, M. J.
Recently developed mapping algorithms allow automated tracking of a propagating coronal wave, enabling the finding of reproducible fronts and propagation trajectories. Coronal observations taken by the Transition Region and Coronal Explorer (TRACE) on 1998 June 13 show a large-scale bright wave front, comparable to ``EIT waves'' seen with the Extr…
Dynamics and evolution of an eruptive flare
Maltagliati, L.; Teriaca, L.; Falchi, A. +2 more
Aims.We study the dynamics and the evolution of a C2.3 two-ribbon flare, developed on 2002 August 11, during the impulsive phase as well as during the long gradual phase. To this end we obtained multiwavelength observations using the CDS spectrometer aboard SOHO, facilities at the National Solar Observatory/Sacramento Peak, and the TRACE and RHESS…
The absolute motion of the peculiar cluster NGC 6791
Anderson, J.; Bedin, L. R.; King, I. R. +2 more
We present improved values of the three components of the absolute space velocity of the open cluster NGC 6791. One HST ACS/WFC field with two-epoch observations provides astrometric measurements of objects in a field containing the cluster center. Identification of 60 background galaxies with sharp nuclei allows us to determine an absolute refere…
The Dynamical State and Blue Straggler Population of the Globular Cluster NGC 6266 (M62)
Valenti, E.; Possenti, A.; Beccari, G. +3 more
We have used a proper combination of multiband high-resolution Hubble Space Telescope WFPC2 and wide-field ground-based observations to image the Galactic globular cluster NGC 6266 (M62). The extensive photometric data set allows us to determine the center of gravity and to construct the most extended radial profile ever published for this cluster…
Observations of the intense and ultra-long burst GRB 041219a with the Germanium spectrometer on INTEGRAL
McGlynn, S.; McBreen, S.; Foley, S. +5 more
Context.GRB 041219a is the brightest burst localised by INTEGRAL. The peak flux of 43 ph cm-2 s-1 (1.84 × 10-5 erg cm-2 s-1, 20 keV-8 MeV, 1 s integration) is greater than that for ~98% of all bursts and the T_90 duration of ~186 s (~20 keV-8 MeV) is longer than all but a small number of burst…
A Spitzer Study of Comets 2P/Encke, 67P/Churyumov-Gerasimenko, and C/2001 HT50 (LINEAR-NEAT)
Gehrz, Robert D.; Woodward, Charles E.; Pittichová, Jana +8 more
We present infrared images and spectra of comets 2P/Encke, 67P/Churyumov-Gerasimenko, and C/2001 HT50 (LINEAR-NEAT) as part of a larger program to observe comets inside of 5 AU from the Sun with the Spitzer Space Telescope. The nucleus of comet 2P/Encke was observed at two vastly different phase angles (20° and 63°). Model fits to the spectral ene…
A close look into the carbon disk at the core of the planetary nebula CPD-56°8032
Wolf, S.; Lopez, B.; Collioud, A. +7 more
Aims.We present high spatial resolution observations of the dusty core of the Planetary Nebula with Wolf-Rayet central star CPD-56°8032, for which indications of a compact disk have been found by HST/SITS observations.
Methods: .These observations were taken with the mid-infrared interferometer VLTI/MIDI in imaging mode providing a typical 30…
MAGIC Observations of Very High Energy γ-Rays from HESS J1813-178
Bastieri, D.; Ciprini, S.; Longo, F. +130 more
Recently, the HESS collaboration has reported the detection of γ-ray emission above a few hundred GeV from eight new sources located close to the Galactic plane. The source HESS J1813-178 has sparked particular interest, as subsequent radio observations imply an association with supernova remnant G12.82-0.02. Triggered by the detection in very hig…
White Dwarf-Red Dwarf Systems Resolved with the Hubble Space Telescope. I. First Results
Hoard, D. W.; Farihi, J.; Wachter, S.
First results are presented for a Hubble Space Telescope (HST) Advanced Camera for Surveys snapshot study of white dwarfs with likely red dwarf companions. Of 48 targets observed and analyzed so far, 27 are totally or partially resolved into two or more components, while an additional 15 systems are almost certainly unresolved binaries. These resu…
Surface Magnetism Effects in Time-Distance Helioseismology
Zhao, Junwei; Kosovichev, Alexander G.
Recent observations of helioseismic holography revealed that magnetic fields that are inclined relative to the line-of-sight direction could cause systematic variations in measured acoustic phase shifts (hereafter, inclined magnetic field effect) and that the presence of surface magnetic field may shift the phases and impair the coherence of acous…