Search Publications
Derivation of elemental abundance maps at intermediate resolution from optical interpolation of lunar prospector gamma-ray spectrometer data
Pinet, Patrick C.; Kaydash, Vadim G.; Shkuratov, Yuriy G. +4 more
We propose a technique that interpolates available lunar prospector gamma-ray spectrometer (GRS) data using Clementine UVVIS spectral reflectance images. The main idea is to use low resolution GRS data as a "ground truth" to establish relationships linking optical data and geochemical information maximizing the respective correlation coefficients.…
Highly ionized gas in the local ISM: Some like it hot?
Lallement, R.; Welsh, B. Y.
We present HST-STIS medium-resolution spectra (R ∼ 6.5 km s-1) of the ultraviolet interstellar absorption lines observed towards 4 early-type stars located within the local interstellar medium (ISM), with sight-line distances <186 pc in the general direction of the Loop I superbubble (l = 330°, b = +18°). These data have been supplem…
Ion distributions in Saturn's magnetosphere near Titan
Cravens, T. E.; Ledvina, S. A.; KecskeméTy, K.
Titan's interaction with Saturn's magnetosphere is studied using a combination of a three-dimensional (3-D) single-fluid magnetohydrodynamic (MHD) simulation and a test particle/Monte Carlo model. The MHD simulation includes an exosphere model based on the one used in the work of Cravens et al. (1998), simple ionospheric processes such as ion prod…
An XMM-Newton look at the Wolf-Rayet star WR 40. The star itself, its nebula and its neighbours
Gosset, E.; Nazé, Y.; Rauw, G. +3 more
We present the results of an XMM-Newton observation of the field of the Wolf-Rayet star WR 40. Despite a nominal exposure of 20 ks and the high sensitivity of the satellite, the star itself is not detected: we thus derive an upper limit on its X-ray flux and luminosity. Joining this result to recent reports of a non-detection of some WC stars, we …
SDSS J024634.11-082536.2: A New Gravitationally Lensed Quasar from the Sloan Digital Sky Survey
Castander, Francisco J.; White, Richard L.; Hall, Patrick B. +14 more
We report the discovery of a new two-image gravitationally lensed quasar, SDSS J024634.11-082536.2 (SDSS J0246-0825). This object was selected as a lensed quasar candidate from the Sloan Digital Sky Survey (SDSS) by the same algorithm that was used to discover other SDSS lensed quasars (e.g., SDSS J0924+0219). Multicolor imaging with the Magellan …
A study of two post-common envelope binary systems
Maxted, P. F. L.; Exter, K. M.; Napiwotzki, R. +2 more
We present intermediate-resolution, phase-resolved spectra of the close-binary systems EC 11575-1845 and V664 Cas, the central star of the planetary nebula HFG 1. Both systems have a very rich emission-line spectrum originating from the face of the cool star, which is irradiated by the hot subdwarf star. The HI emission lines are wide, consistent …
Structure of magnetic fields in NOAA active regions 0486 and 0501 and in the associated interplanetary ejecta
Yurchyshyn, Vasyl; Abramenko, Valentyna; Hu, Qiang
Spectacular burst of solar activity in October-November 2003, when large solar spots and intense solar flares dominated the solar surface for many consecutive days, caused intense geomagnetic storms. In this paper we analyze solar and interplanetary magnetic fields associated with the storms in October-November 2003. We used space- and ground-base…
An X-ray emission-line spectrum of Nova V382Velorum 1999
Schmitt, J. H. M. M.; Ness, J. -U.; Jordan, C. +2 more
We report on the analysis of an X-ray grating spectrum of the Classical Nova V382Vel (1999), obtained with the Low Energy Transmission Grating (LETG)+HRC-S instrument onboard Chandra, which shows emission lines dominating over any continuum. Lines of Si, Mg, Ne, O, N and C are identified, but no Fe lines are detected. The total luminosity in the l…
Heliospheric energetic particle observations during the October-November 2003 events
Livi, S.; Russell, C. T.; Lario, D. +4 more
The intense level of solar activity recorded from 19 October to 12 November 2003 led to unusually high energetic particle intensities observed throughout the heliosphere. The fleet of spacecraft distributed in the inner and outer heliosphere offers us the opportunity to study both the effects of these events in different regions of the heliosphere…
Solar Feature Catalogues In Egso
Zharkova, V. V.; Aboudarham, J.; Zharkov, S. +3 more
The Solar Feature Catalogues (SFCs) are created from digitized solar images using automated pattern recognition techniques developed in the European Grid of Solar Observation (EGSO) project. The techniques were applied for detection of sunspots, active regions and filaments in the automatically standardized full-disk solar images in CaII K1, CaII …