Search Publications
Missions
Journals
Publication Years
Possible role of electromagnetic low frequency waves in the Io torus in the production of Jovian aurorae
Balogh, A.; Belmont, G.; Forsyth, R. J. +4 more
The possible role of ULF waves observed in the Io torus in the generation of Jovian autorae is investigated. Aaroral emissions have been observed, not only at high latitude, but also at the footprint of magnetic field lines connected to the Io torus in a limited loagitudinal range around 150°. As Ulysses passed by Jupiter, it explored the Io torus…
Overview of the soho mission
Bonnet, R. M.; Felici, F.
The SOHO spacecraft was launched on 2 December 1995, some 8 years after it started to be developed by European industry. Since 14 February 1996, SOHO is in a halo orbit around the Lagrangian point L1. It is continuously in view of the Sun, allowing uninterrupted sequences of observations of our star, a first in the development of solar physics. It…
Asymmetric Hα disk emission dominates the HST/FOS spectrum of Circinus X-1.
Caraveo, P. A.; Bignami, G. F.; Mignani, R.
CircinusX-1 is an highly variable X/radio binary source showing regular flux modulations with a periodicity of ~16.6days, probably coincident with the orbital period of the binary system. Here we present HST/FOS spectra of the optical counterpart taken around the predicted X-ray maximum. Strong Hα in emission, itself accounting for almost 50% of t…
HST Data suggest proper motion for the optical counterpart of GRB 970228.
Caraveo, P. A.; Bignami, G. F.; Mignani, R. P. +1 more
After a quarter of a century of γ-ray burst (GRB) astronomy, the Italian-Dutch satellite BeppoSAX on Feb 28^th^, 1997 detected a soft X-ray afterglow from GRB 970228 and positioned it accurately. This made possible the successful detection of an optical transient. Two public Hubble Space Telescope (HST) images of the GRB/optical transient region w…
The Infrared Spectrum of Comet Hele–Bopp as Seen by the Infrared Space Observatory
Altieri, B.; Keller, H. U.; Lellouch, E. +6 more
Spectra of comet C/1995 O1 (Hale-Bopp) were obtained with the Infrared Space Observatory (ISO) at medium resolution with the grating spectrometer in the photometer (PHT-S) and/or at high resolution with the short wavelength spectrometer (SWS) and long wavelength spectrometer (LWS) in April 1996 (Crovisier et al., 1996), September–October 1996 (Cro…
The Jet of the Quasar 3C 273 at High Resolution.
Davis, R. J.; Meisenheimer, K.; Roeser, H. -J. +3 more
UV Observations of dwarf novae in quiescence - effects of evaporation?
Meyer, F.; Meyer-Hofmeister, E.; La Dous, C.
IUE spectra of dwarf novae in quiescence provide information on the inner part of the accretion disk. In the framework of the evaporation model the mass flow of about 10^-11^Msun_/yr is understood as accretion via a hot corona above the cool inert disk. The UV radiation originates from the transition region between disk and corona, and …
Young nuclei in elliptical galaxies
Sil'chenko, O. K.
Chemically distinct nuclei have been found in the three elliptical galaxies NGC 4564, NGC 4621, and NGC 5576. These nuclei are appreciably younger than the surrounding regions: in the nuclei of NGC 4564 and NGC 4621, the mean age of the stellar population is 8 billion years, and in NGC 5576, it is 3 billion years. Studies of the rotation of the st…
The chemical composition and binarity of beta Crateris
Stickland, D. J.; Kellett, B. J.; Smalley, B. +1 more
A detailed abundance analysis of the bright A-type star betaCrt is presented. It is found that most of the abundances are essentially solar, indicating that the star is not a hot Am star. The only prominent anomalies are an underabundance of Al and overabundances of S, Sr and Ba. The barium overabundance is the most prominent and has important imp…
Acceleration and modulation of energetic particles in the 3-D heliosphere by corotating interaction regions
Simnett, G. M.; Roelef, E. C.
The passage of the Ulysses spacecraft over the poles of the Sun in 1994/1996 has given us a unique insight into the physics of the third dimension of the heliosphere. During the 30-month transit from Jupiter to the south polar pass, the low-latitude heliosphere was dominated by a high speed solar wind stream which produced a corotating interaction…