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Extreme-ultraviolet diagnostics of pick-up ions in regions close to the solar corona. I. Feasibility of new observations
Fichtner, Horst; Fahr, Hans-Joerg; Scherer, Horst
Recent investigations of pick-up ion data obtained with the AMPTE and the Ulysses spacecraft resulted in the discovery that, in contrast to previous expectation, pick-up ion velocity distribution can be anisotropic. Such anisotropy results from a smaller efficiency of pitch-angle scattering than usually assumed and translates into a larger scatter…
ISO LWS Observations of H2O from R Cas: A Consistent Model For Its Circumstellar Envelope
Omont, A.; Barlow, M. J.; Cox, P. +6 more
We present an ISO LWS 43-197 µm grating spectrum of the oxygen-rich AGB star R Cas. The spectrum is rich of isolated and blended H2O lines. For their identification and in order to determine the physical parameters of the circumstellar envelope, we have constructed a model which treats radiative transfer, chemical exchange and photodissociation re…
Measurement of Plasma Velocity Distributions
Schwartz, Steven J.; Fazakerley, Andrew N.; Paschmann, Götz
The 3.4 Microns Absorption Feature in CRL 618
Tielens, A. G. G. M.; Geballe, T. R.; Chiar, J. +1 more
Separate Spectra of the Components of the Low-Mass BinariesRoss 614A,B and L722-22A,B
Hershey, John L.; Chance, Don R.
The Hubble Space Telescope Faint Object Spectrograph has been used to acquire separate spectra of each of the component stars in the binaries Ross 614A,B (Gl 234A,B) and L722-22A,B (GJ 1005). Spectral types have been determined for each: M4.0 V, M5.5 V, M3.5 V, and M5.0 V, respectively, relative to a series of ground-based CCD spectra, in the 6500…
The Electron Drift Technique for Measuring Electric and Magnetic Fields
Torbert, R. B.; Quinn, J. M.; Paschmann, G. +2 more
The electron drift technique is based on sensing the drift of a weak beam of test electrons that is caused by electric fields and/or gradients in the magnetic field. These quantities can, by use of different electron energies, in principle be determined separately. Depending on the ratio of drift speed to magnetic field strength, the drift velocit…
HD 6226: a new bright B variable with occasional brightenings. Is it an unrecognized Be star?
Harmanec, P.; Bozic, H.
An analysis of differential UBV measurements of HD 6226 secured between 1982 and 1995 at Hvar, and combined with the Hipparcos satellite H_p photometry, led to the finding that this infrequently observed star is a new variable, characterized by occasional brightenings accompanied by the reddening of the B-V, and blueing of the U-B index. We note t…
Evolution of Southern Star-Forming Regions
Thi, W. F.; Burgdorf, M.; van Dishoeck, E. F. +5 more
We present ISO observations of bright, high-mass southern starforming regions with the Short Wavelength Spectrometer (SWS) and Long Wavelength Spectrometer (LWS). The selected targets show a range of pre-main sequence evolutionary phases. Whereas some objects still show interstellar ice features, the most evolved objects are coincident with ultra-…
Particle propagation channel detected at 4.7 AU inside a corotating interaction region
Pick, M.; Lanzerotti, L. J.; Sarris, E. T. +5 more
This study presents an interplanetary particle (electrons and ions) event which was detected at 4.7 AU by the instruments on the Ulysses spacecraft inside a corotating interaction region between a fast and slow solar wind stream. A particle propagation channel is identified where the particles can propagate from the Sun nearly scatter free within …
Diffuse Ionized Gas in the beta CMa Tunnel
Gry, C.; Dupin, O.
We present HST observations of the interstellar medium toward the star beta CMa known to be located in a low density extension of the Local Bubble. Most of the matter in the sight-line is ionized and clumped in two main components. One of them, as well as one of the components detected toward epsilon CMa, is mostly ionized and only slightly deplet…