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Ion cyclotron waves in the Jovian magnetosphere
Dougherty, M. K.; Southwood, D. J.; Lachin, A.
Magnetic field data from the inbound Ulysses flyby past Jupiter in February 1992 is examined for evidence of ion cyclotron wave activity. Particular interest has been paid to the near equatorial current sheet within the middle magnetosphere where the field magnitude ranges between 5-60 nT. Power spectral peaks in the ion cyclotron range are easily…
A New Color Image of the Crab Nebula
Wainscoat, R. J.; Kormendy, J.
A new color image of the Crab Nebula is presented. This is a 2782 × 1904 pixel mosaic of CCD frames taken through B (blue), V (green), and R (red) filters; it was carefully color balanced so that the Sun would appear white. The resolution of the final image is approximately 0.8 arcsec FWHM. The technique by which this image was constructed is desc…
Direct demodulation image reconstruction of ME/EXOSAT Galactic Plane Survey.
Lu, Fangjun; Wu, Mei; Li, Tibei +1 more
The authors have reanalyzed the ME/EXOSAT Galactic Plane scan observational data with direct demodulation technique. They have studied the discrete X-ray sources in the regions which were unresolved in previous analyses. Using the bootstrap method, they have analyzed the statistical accuracy of the results and determined the position and flux erro…
Effects of High Ion Temperatures on Spectral Line Diagnostics in the Source Region of the High-speed Solar Wind
Esser, R.; Brickhouse, N. S.
Theoretical work on solar wind acceleration has suggested that the proton and electron temperatures at the base of the solar coronal hole region are not thermally equilibrated but that instead the proton temperature may exceed the electron temperature significantly. Recently, Kohl, Strachan, & Gardner have measured both broad and narrow compon…
Synthetic Spectra of Long-Period Variables: A First Comparison with ISO Observations
Aringer, Bernhard; Loidl, Rita; Hron, Josef +3 more
Exploratory synthetic spectra were computed for carbon-rich long-period variables. We used dynamic model atmospheres of Höfner & Dorfi (1997) and calculated partial pressures, absorption- and scattering coefficients as input for the spectral synthesis code of Jørgensen et al. (1992). First ISO SWS-observations of the carbon-Mira T Dra are comp…
The strongly constrained interacting binary BY Crucis.
Mayor, M.; Waelkens, C.; Daems, K.
We discuss spectroscopic and photometric observations (UV to IR) of BY Crucis, a new bright member of the interacting binaries of the W Serpentis class. The orbital period is 106.4days, and the mass function amounts to 5.92Msun_. The primary is an early-F supergiant which fills its Roche lobe; the massive secondary is hidden inside a th…
Ultraviolet observations of comet Hale-Bopp
Feldman, Paul D.
Ultraviolet spectroscopy and imaging of comet Hale-Bopp (C/1995 O1) were obtained from a variety of space platforms from shortly after the discovery of the comet through perihelion passage. Observations with the International Ultraviolet Explorer (IUE) and the Hubble Space Telescope (HST) spanned the range of 6.8 to 2.7 AU pre-perihelion, but IUE …
Ultraviolet DIB at 1369 A Arising in Molecular Clouds
Gnacinski, P.; Sikorski, J.; Kaczmarczyk, G.
Hubble Space Telescope (HST) and IUE observations of the weak unidentified interstellar line 1369 A in nine early type stars are discussed. This absorption feature might be a diffuse interstellar band (DIB). We have found good correlation between the equivalent widths of the 1369 A line and the interstellar CO A1Pi-X1Sigma (6…
Chromospherically Active Stars. XVI. The Double-Lined Binary 42 Capricorni
Fekel, Francis C.
New spectroscopic observations of the chromospherically active binary, 42 Capricorni, have resulted in the detection of lines of the secondary, improved orbital elements, and the determination of fundamental properties of the components. 42 Cap has an orbital period of 13.174004 d, an eccentricity of 0.176, and a mass ratio A/B of 1.375. No eviden…
Optical design of the coronal diagnostic spectrometer (an instrument on the Solar and Heliospheric Observatory)
Lidiard, Kate A.; Gray, Peter F.
The coronal diagnostic spectrometer (CDS) is one of 12 instruments that form the payload of the joint European Space Agency/National Aeronautics and Space Agency Solar and Heliospheric Observatory, launched in 1995. The CDS was designed and constructed by an international consortium led by the Rutherford Appleton Laboratory, United Kingdom. It is …