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HST and spectroscopic observations of the L1551 IRS5 jets (HH154)
Liseau, R.; White, G. J.; Favata, F. +4 more
We have carried out a thorough optical study of the closest star formation jet. The inner arcminute surrounding the class 0/I binary protostar L1551 IRS5 and its associated jet (HH154) have been observed using the Hubble Space Telescope with the WFPC2 camera, the ESO New Technology Telescope with the EMMI spectrograph and the Nordic Optical Telesc…
Detection of Silicon Nitride Particles in Extreme Carbon Stars
Sturm, E.; Mutschke, H.; Henning, Th. +4 more
On the basis of spectra taken by the Infrared Space Observatory and laboratory measurements, we present the first spectroscopic evidence for the presence of silicon nitride (Si3N4) grains in the circumstellar shells of a number of extreme carbon stars. Laboratory measurements of α, β, and amorphous Si3N4…
VLT UVES Observations of the Balmer Line Variations of η Carinae during the 2003 Spectroscopic Event
Weis, K.; Stahl, O.; Bomans, D. J. +3 more
We present high spectral resolution echelle observations of the Balmer line variations during the 2003.5 ``spectroscopic event'' of η Carinae. Spectra have been recorded of both η Car and the Homunculus at the ``FOS4'' position in its southeast lobe. This spot shows a reflected stellar spectrum that is less contaminated by nebular emission lines t…
Correlation between coronal hole and quiet Sun intensities: Evidence for continuous reconnection
Del Zanna, G.; Raju, K. P.; Bromage, B. J. I. +1 more
Intensities of 12 strong EUV emission lines in a coronal hole and the neighbouring quiet Sun region have been obtained from SOHO/CDS observations made in August and September 1996. The field of view is 1 arcmin wide by 4 arcmin, with a series of observations made at different spatial locations on the boundary of the north polar hole and its large …
First Ultraviolet Spectrum of a Brown Dwarf: Evidence for H2 Fluorescence and Accretion
Gizis, John E.; Shipman, Harry L.; Harvin, James A.
We analyze an HST STIS ultraviolet spectrum of the young brown dwarf 2MASSW J1207334-393254, a member of the 10 million year old TW Hya association that has a planetary-mass companion. We detect and identify numerous emission lines. C IV and other ions are seen that arise in hot gas. We identify a series of lines with Lyman-pumped H2 mo…
The Near-Earth Solar Wind
Eastwood, J. P.; Lucek, E. A.; Décréau, P. +3 more
Initial localization and kinematic characteristics of the structural components of a coronal mass ejection
Hudson, H. S.; Grechnev, V. V.; Uralov, A. M.
The leading component of a coronal mass ejection (CME), its observed frontal structure (FS), has been detected close to the solar surface in a few near-the-limb events only. Thus far, no manifestations of such a frontal structure have been reported in reasonable proximity to a preeruptive filament located away from the solar limb. Thus the identif…
Proton and electron acceleration by quasi-perpendicular fast magnetosonic shocks in interplanetary space
Simnett, G. M.; Forsyth, R. J.; Sakai, J. -I.
Recent observations from the Ulysses spacecraft (Simnett 2003, Sol. Phys., 213, 387) have measured the energy spectrum of the ambient ions associated with the passage of a fast magnetosonic quasi-perpendicular shock driven by a coronal mass ejection (CME). Near the shock front the energy spectrum of the accelerated ions, which are predominantly pr…
The icy Galilean satellites: ultraviolet phase curve analysis
Domingue, Deborah L.; Hendrix, Amanda R.; King, Kimberly
Ultraviolet disk-integrated solar phase curves of the icy galilean satellites Europa, Ganymede, and Callisto are presented, using combined data sets from the International Ultraviolet Explorer (IUE), Hubble Space Telescope (HST), and the Galileo Ultraviolet Spectrometer. Global, disk-integrated solar phase curves for all three satellites, in addit…
The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr
Pereira, C. B.; Mikołajewska, J.; Ferrer, O. E. +4 more
We present a study of the eclipsing symbiotic binary FN Sgr with a period of 568.3 days determined photometrically and confirmed spectroscopically. The hot component underwent a 2.5 mag eruption covered by most of our spectroscopic observations. In particular, we have determined for the first time spectroscopic orbits based on the radial velocity …