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The European Large Area ISO Survey

Oliver, Seb; Pozzi, Francesca

The European Large Area ISO Survey (ELAIS) was the largest Open Time survey on the Infrared Space Observatory (ISO). It was designed to explore obscured galaxies and hence quantify the recent star-formation history of the Universe. The final reanalysis of the data has been completed and a band-merged catalogue with associations across many wavelen…

Energetic Particles Observed in the CUSP Region During a Storm Recovery Phase

Reme, H.; Korth, A.; Daly, P. +4 more

In this paper we report energetic ion behavior and its composition variations observed by the Cluster/RAPID instrument when the spacecraft was travelling in the high latitude magnetospheric boundary region on the day of the 31 March, 2001, strongest magnetic storm in the past 50 years. The Dst index reached ‑360 nT at about 09:00 UT. During its ea…

Ultracool dwarf binaries

Bouy, H.; Bouvier, J.; Brandner, W. +1 more

We review here the multiplicity properties of ultracool dwarfs (spectral type later than M6) observed in three different environments and at three different ages: in the field, where the objects are relatively old (1-5 Gyrs) and isolated, in the Pleiades young (∼120 Myr) open cluster, and in the young (∼5 Myr) Upper Scorpius OB association (USco).…

Improvement of plasma measurements onboard Cluster due to spacecraft potential control

Escoubet, C. P.; Dandouras, I.; André, M. +6 more

The ion emitter experiment ASPOC (Active Spacecraft Potential Control) and the plasma electron experiment PEACE (Plasma Electron And Current Experiment) have been operating together in a large variety of plasma environments. Three cases on February 4, 2001, May 21, 2002, and June 12, 2002 have been analysed. A clear improvement of the electron mea…

The evolutionary status of the bright high-latitude supergiant HD 190390

Cuypers, J.; Reyniers, M.

Despite its mean apparent magnitude of m_V = 6.39, the evolutionary status of HD 190390 (HR 7671), a luminous F-type supergiant at high galactic latitude, is still not very clear, but in most papers a post-AGB classification is assumed. New observational material has been obtained with four different…

Energetic Electrons in Loop Top and Footpoint Microwave Sources

Zhou, A. H.; Su, Y. N.; Huang, G. L.

We have studied two microwave events with one-loop top (LT) and two-footpoint (FP) sources observed at 17 and 34 GHz by the Nobeyama Radioheliograph (NoRH). The microwave brightness peak is located near the FPs of the flare loop for one event, but near the LT for the other event. The microwave spectra of the FP sources are considerably softer (by …

Structures of Sub-keV Ions Inside the Ring Current Region

Lundin, R.; Yamauchi, M.; Dandouras, I. +5 more

The Jacobi constant for a cometary orbiter

Mysen, E.; Aksnes, K.

The Jacobi constant of a probe under the gravitational attraction of a rotating irregular body is rederived for excited, but free rigid rotation of the central mass. A related Tisserand-like quantity is found to be sufficiently conserved for it to qualify as a pseudo-integral. The quantity's near constancy is shown to imply that certain regions in…

Optical and X-Ray Observations of the Symbiotic System Ag Draconis During Quiescence and Outburst

Friedjung, Michael; González-Riestra, Rosario; Greiner, Jochen +6 more

We review the main characteristics of the symbiotic system AG Draconis, with special emphasis on its optical and X-ray variations. We also discuss the X-ray to visual energy distribution during quiescence and outburst and describe our spectroscopic and X-ray observations during the 2003 outburst.

Hector Servadac et les comètes de Jules Verne.

Crovisier, J.

"Hector Servadac" ("Off on a Comet") is a novel by Jules Verne published in 1877. Anticipating the Rosetta mission, it fantasizes about the in situ exploration of a comet by a small group of castaways. This novel illustrates what was publicly known on comets at that time.