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A closer look at main belt asteroids 1: WF/PC images
Weiss, B. P.; Storrs, A. D.; Zellner, B. +3 more
We present new reconstructions of images of main belt Asteroids 9 Metis, 18 Melpomene, 19 Fortuna, 216 Kleopatra, and 624 Hektor, made with the uncorrected Wide-Field/Planetary Camera (WF/PC) on the Hubble Space Telescope (HST). Deconvolution with the MISTRAL algorithm demonstrates that these asteroids are clearly resolved. We determine diameters,…
An XMM-Newton Study of the Coronae of σ2 Coronae Borealis
Güdel, Manuel; Audard, Marc; Suh, Jin A. +1 more
We present results of XMM-Newton Guaranteed Time observations of the RS CVn binary σ2 Coronae Borealis. The spectra obtained with the Reflection Grating Spectrometers and the European Photon Imaging Camera MOS2 were simultaneously fitted with collisional ionization equilibrium plasma models to determine coronal abundances of various ele…
Low-energy absorption towards the ultra-compact X-ray binary 4U 1850-087 located in the globular cluster NGC 6712
Parmar, A. N.; Sidoli, L.; La Palombara, N. +1 more
We report the results of two XMM-Newton observations of the ultra-compact low-mass X-ray binary 4U 1850-087 located in the galactic globular cluster NGC 6712. A broad emission feature at 0.7 keV was detected in an earlier ASCA observation and explained as the result of an unusual Ne/O abundance ratio in the absorbing material local to the source. …
The Prominent Dust Emission Feature near 8.9 µm in Four H II Regions
Hayward, T. L.; Tielens, A. G. G. M.; Boogert, A. C. A. +2 more
We present a mid-infrared study of four H II regions based on the combination of Infrared Space Observatory (ISO) SWS observations with spatial information from SpectroCam-10 images and long-slit spectra. We report a prominent broad emission feature near 8.9 µm. The peak position and width of this feature do not resemble known polycyclic aro…
A statistical study of intense electric fields at 4-7 RE geocentric distance using Cluster
Buchert, S.; Karlsson, T.; Marklund, G. +3 more
Intense high-latitude electric fields (>150 mV/m mapped to ionospheric altitude) at 4 7 RE geocentric distance have been investigated in a statistical study, using data from the Cluster satellites. The orbit of the Cluster satellites limits the data collection at these altitudes to high latitudes, including the poleward part of the a…
Molecular Hydrogen in Orion as Observed by the Far Ultraviolet Spectroscopic Explorer
France, K.; McCandliss, S. R.
Diffuse far-ultraviolet stellar emission scattered by dust grains has been observed in a region near the Orion Nebula. In addition to the scattered stellar continuum, emission and absorption features produced by molecular hydrogen have been identified. In this Letter, we present an analysis of this absorption and fluorescent emission from molecula…
Microwave, Optical, EUV, and Hard X-Ray Signature of Possible Coronal Loop Interaction
Ji, Haisheng; Huang, Guangli
In this paper, we present a comprehensive picture for the M2.0 class flare of September 9, 2002 with an extensive multi-wavelength analysis. The flare was observed by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI), the Owens Valley Solar Arrays (OVSA), and Big Bear Solar Observatory (BBSO). At BBSO, the observation was specially made a…
Bowen excitation of N III lines in symbiotic stars
Munari, U.; Wahlgren, G. M.; Johansson, S. +3 more
We present a semi-empirical equation for prediction of the strengths of those N III lines that are generated by the Bowen mechanism and observed in spectra of symbiotic stars. The equation assumes that the Bowen mechanism is the only source populating the 3d state in N III, and comparisons with observations of the 3s-3p and 3p-3d transitions serve…
Detection and analysis of a new INTEGRAL hard X-ray transient, IGR J17285-2922
Hill, A. B.; Capitanio, F.; Bird, A. J. +10 more
We present the transient nature of INTEGRAL source IGR J17285 2922, identified from a single period of activity during an IBIS/ISGRI Galactic Centre Deep Exposure in September 2003. The source has a maximum detection significance of 14σ in the 20 100 keV energy range and exhibits a flux of 6.5 mCrab before it moves out of the ISGRI field of view. …
Ion composition variations in the plasma sheet observed by Cluster/RAPID
Zong, Q. -G.; Daly, P. W.; Ruan, P. +5 more
Based on the energetic particle measurements obtained by Cluster/RAPID (Research with Adaptive Particle Imaging Detectors), ion composition variations in the plasma sheet have been investigated. By comparing observations during quiet and storm intervals, it is found that, in addition to the enhanced energy density for all ion species, the ratio of…