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Analysis of Ulysses data: Radiation pressure effects on dust particles
Krüger, H.; Grün, E.; Wehry, A.
The objective of this paper is to illustrate the influence of the radiation pressure and the electromagnetic force on dust particles in interplanetary space. Between 1990 and 2001 62 so-called β-meteoroids (β describes the ratio of the radiation pressure force to gravity) were detected as dust particles coming from the inner solar system on hyperb…
Orbits and masses of Saturn's coorbital and F-ring shepherding satellites
French, Richard G.; Jacobson, Robert A.
We have obtained numerically integrated orbits for Saturn's coorbital satellites, Janus and Epimetheus, together with Saturn's F-ring shepherding satellites, Prometheus and Pandora. The orbits are fit to astrometric observations acquired with the Hubble Space Telescope and from Earth-based observatories and to imaging data acquired from the Voyage…
A 150 MG Magnetic White Dwarf in the Cataclysmic Variable RX J1554.2+2721
Gänsicke, B. T.; Beuermann, K.; de Martino, D. +4 more
We report the detection of Zeeman-split Lyα absorption π and σ+ lines in the far-ultraviolet Hubble Space Telescope/Space Telescope Imaging Spectrograph (STIS) spectrum of the magnetic cataclysmic variable RX J1554.2+2721. Fitting the STIS data with magnetic white dwarf model spectra, we derive a field strength of B~=144 MG and an effec…
The August 11th, 1999 CME
Koutchmy, S.; Baudin, F.; Bocchialini, K. +5 more
We present here a set of observations, space borne and ground based, at different wavelengths, of the solar corona at and after the time of the total solar eclipse of August 11{th}. It is used to consider some unusual features of the coronal dynamics related to a limb Coronal Mass Ejection (CME) observed after the total eclipse. The complementary …
Classical and MgII-selected damped Lyman α absorbers: impact on ΩHI at z < 1.7
Deharveng, Jean-Michel; Péroux, Céline; Cristiani, Stefano +1 more
The damped Lyα systems (DLAs), seen in absorption in the spectrum of background quasars, are believed to contain a large fraction of the neutral gas in the Universe. Paradoxically, these systems are more difficult to observe at zabs < 1.7, since they are rare and their HI feature then falls in UV spectra, thus requiring the use of sp…
Variations of the hard X-ray footpoint asymmetry in a solar flare
Siarkowski, M.; Falewicz, R.
We analysed hard and soft X-ray observations from the SXT and HXT instruments on the Yohkoh satellite of an X5.3 class flare of 25 August 2001. The most prominent features of this flare are: a fast (450 km s-1), hard (up to 90 keV) and compact X-ray moving feature, two clear footpoint sources, and loop-top emission between them. The Yoh…
Reanalysis of Copernicus Measurements of Interstellar Carbon Monoxide
Federman, S. R.; Crenny, T.
We used archival data acquired with Copernicus to reexamine CO column densities, as self-consistent oscillator strengths are now available. Our focus is on lines of sight containing modest amounts of molecular species. Our resulting column densities are small enough that self-shielding from photodissociation does not occur in the clouds probed by …
Multiwavelength study of the very long GRB 020410
Piro, L.; Pian, E.; Costa, E. +12 more
GRB 020410 is by far the longest γ-ray burst (with a duration of about 1600 s) to have been followed up from the X-ray through the radio regime. Afterglow emission was detected in X-rays and at optical wavelengths whereas no emission was detected at 8 GHz brighter than 120 µJy. The decaying X-ray afterglow, back-extrapolated to 11 h after th…
Infrared mergers and infrared quasi-stellar objects with galactic winds - I. NGC 2623: nuclear outflow in a proto-elliptical candidate
Terlevich, R.; Lípari, S.; Díaz, R. J. +4 more
We present the first results of a study of the morphology, kinematics and ionization structure of infrared (IR) mergers/quasi-stellar objects (QSOs) with galactic winds. This study is based mainly on INTEGRAL two-dimensional (2D) fibre spectroscopy [obtained on the 4.2-m William Herschel Telescope (WHT), La Palma] combined with high-resolution Hub…
Classification of Spectra from the Infrared Space Observatory PHT-S Database
Kraemer, Kathleen E.; Price, Stephan D.; Walker, Helen J. +1 more
We have classified over 1500 infrared spectra obtained with the PHT-S spectrometer aboard the Infrared Space Observatory according to the system developed for the Short Wavelength Spectrometer (SWS) spectra by Kraemer et al. The majority of these spectra contribute to subclasses that are either underrepresented in the SWS spectral database or cont…