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GX340+0 with EXOSAT: its correlated X-ray spectral and timing behaviour.
van der Klis, M.; Kuulkers, E.
We report on three observations of the Z source GX340+0 performed with EXOSAT during 1985 and 1986. In two observations the source was in the horizontal branch and the upper part of the normal branch of the Z pattern in the X-ray colour-colour diagram, while in the third observation it was in the normal and flaring branches. We found that the hori…
Observations of the central star and nebula of Abell 65.
Walsh, J. R.; Walton, N. A.
Imaging and spectrophotometry of the low surface brightness planetary nebula Abell 65 and its eclipsing binary central star are presented. The spectrum of the central star is remarkable in showing H and He lines in emission, similar to the spectra of cataclysmic variables. This is the second PN central star, after HFG 1, to show such stellar line …
The abundance of boron in evolved A- and B-type stars.
Lambert, D. L.; Venn, K. A.; Lemke, M.
Boron abundances in A- and B-type stars may be a successful way to track evolutionary effects in these hot stars. The light elements - Li, Be, and B - are tracers of exposure to temperatures more moderate than those in which the H-burning CN-cycle operates. Thus, any exposure of surface stellar layers to deeper layers will affect these light eleme…
The central star of LoTr5 revisited.
Jasniewicz, G.; Thevenin, F.; Monier, R. +1 more
We report on new photometric and spectroscopic observations carried out in 1994 of the late-type star HD112313 in the binary nucleus of the planetary nebula LoTr5. From comparison with model spectra we derive a gravity logg=2.7+/-0.5 and an effective temperature T_eff_=5250+/-200K, in full agreement with a spectral type G5III. Iron is found to be …
ULYSSES observations of open and closed magnetic field lines within a coronal mass ejection.
Balogh, A.; Forsyth, R. J.; Goldstein, B. E. +7 more
During the rapid passage from the Sun's south to north polar regions, the Ulysses spacecraft encountered in February 1995, at 24°S, a coronal mass ejection (CME) exactly at the time when it crossed from high speed solar wind coronal hole flow into low speed streamer belt flows. We have investigated this CME, which was superimposed on an energetic …
MWC 314: a high-luminosity peculiar Be star.
Miroshnichenko, A. S.
New broad-band multicolor photometry and optical spectroscopy of the emission-line star MWC 314= BD +14deg3887 as well as a study of its ultraviolet spectrum are reported. It is shown that the star exhibits photometric variability with a quasi-regular component. Main parameters of the star and its envelope are determined from both the spectral ene…
Flare energetics: analysis of a large flare on YZ Canis Minoris observed simultaneously in the ultraviolet, optical and radio.
Doyle, J. G.; Pagano, I.; Linsky, J. L. +7 more
The results of coordinated observations of the dMe star YZ CMi at optical, UV and radio wavelengths during 3-7 February 1983 are presented. YZ CMi showed repeated optical flaring with the largest flare having a magnitude of 3.8 in the U-band. This flare coincided with an IUE exposure which permits a comparison of the emission measure curves of YZ …
A comparison of interplanetary coronal mass ejections at ULYSSES with YOHKOH soft X-ray coronal events.
Forsyth, R. J.; Burkepile, J. T.; Phillips, J. L. +5 more
Coronal Mass Ejections (CMEs) observed at several AU by the Ulysses spacecraft are mapped radially back to the Sun and compared with Yohkoh Soft X-ray Telescope (SXT) images of the corona in an effort to identify correlated events. Correlations between the observations were difficult to make during the ecliptic phase of the Ulysses mission when th…
ISO observations of Wolf-Rayet galaxy Haro 3.
Hanlon, L.; McBreen, B.; Clavel, J. +9 more
Observations of the blue compact dwarf galaxy Haro 3 have been obtained with the ISOCAM and ISOPHOT instruments on the Infrared Space Observatory (ISO). The PHT-S spectrum (6-12µm) is dominated by four emission bands that are frequently attributed to polycyclic aromatic hydrocarbons (PAHs) and strong SIV emission. Two CAM filters, LW6 (7-8.5…
ULYSSES at high heliographic latitudes: an introduction.
Smith, E. J.; Cooper, J. F.; Marsden, R. G. +1 more
The unique in situ observations acquired by the scientific instrumentation on board the Ulysses spacecraft have provided, for the first time, a comprehensive, 3-dimensional view of the heliosphere from the solar equator to the poles near solar minimum. Since beginning its journey out of the ecliptic plane in February, 1992, Ulysses has acquired a …