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The symbiotic star CH Cygni - II. The ejecta from the 1998-2000 active phase
Davis, R. J.; Eyres, S. P. S.; Bode, M. F. +7 more
We present Hubble Space Telescope (HST) imaging, a Very Large Array (VLA) radio map (4.74 GHz), optical high-resolution (echelle) spectroscopy and UBV photoelectric photometry of the symbiotic star CH Cyg obtained during its 1998-2000 active phase. The HST imaging, taken during eclipse, shows the central stars are embedded in a nebula extending to…
Spiral Galaxies with HST/NICMOS. II. Isophotal Fits and Nuclear Cusp Slopes
Stiavelli, Massimo; de Zeeuw, P. Tim; Carollo, C. Marcella +2 more
We present surface brightness profiles for 56 of the 78 spiral galaxies observed in the HST/NICMOS2 F160W snapshot survey introduced in Paper I of this series, as well as surface brightness profiles for 23 objects out of the 41 that were also observed in the F110W filter. We fit these surface brightness profiles with the Nuker law of Lauer et al. …
Australia Telescope Compact Array Radio Imaging of the Proplyd-like Objects in the Giant H II Region NGC 3603
Corcoran, M. F.; Koribalski, B. S.; Stevens, I. R. +2 more
Three cometary-shaped objects in the giant H II region NGC 3603, originally found and identified as proto-planetary disks (proplyds) by Brandner and coworkers using the Hubble Space Telescope and the Very Large Telescope in the optical and near-infrared, have been detected with the Australia Telescope Compact Array5 in the radio continuum at 3 and…
Detection of solid ammonia, methanol, and methane with ISOPHOT.
Ábrahám, P.; Henning, Th.; Lemke, D. +4 more
We report on a search for the NH3 inversion band at 9.0 mu m, the CH4 band at 7.7 mu m, and the CH3OH band at 9.7 mu m in the spectra of 10 heavily obscured stellar objects taken with the spectrophotometer ISOPHOT-S aboard the Infrared Space Observatory (ISO). Four of them show indications of the NH3 inv…
OH/IR stars in the inner bulge detected by ISOGAL
Blommaert, J. A. D. L.; Ganesh, S.; Omont, A. +6 more
We present a study of known OH/IR stars in the inner bulge, observed by the ISOGAL survey at lambda = 6.8 mu m and lambda = 14.9 mu m. Bolometric corrections and luminosities are computed, based on near and mid-infrared data. The vast majority of the sources exhibit mass-loss rates in the range: 3 x 10-7 up to a few times 10-5
XMM-Newton EPIC observations of Her X-1
Ramsay, Gavin; Hailey, C. J.; den Herder, Jan-Willem +2 more
We present spin-resolved X-ray data of the neutron star binary Her X-1 taken using the EPIC detectors on XMM-Newton. The data were taken at three distinct epochs through the 35-d precession period. The energy-dependent light curves of this source vary significantly from epoch to epoch. It is known that the relative phasing of the soft (<~1 keV)…
Hydrogen infrared recombination lines as a diagnostic tool for the geometry of the circumstellar material of hot stars
Waters, L. B. F. M.; de Koter, A.; Lenorzer, A.
We have analysed the infrared hydrogen recombination lines of a sample of well studied hot massive stars observed with the Infrared Space Observatory. Our sample contains stars from several classes of objects, whose circumstellar environment is believed to be dominated by an ionized stellar wind (the Luminous Blue Variables) or by a dense disk-lik…
The symbiotic star CH Cygni - III. A precessing radio jet
Davis, R. J.; Eyres, S. P. S.; Bode, M. F. +3 more
VLA, MERLIN and Hubble Space Telescope imaging observations of the extended regions of the symbiotic system CH Cygni are analysed. These extensions are evidence of a strong collimation mechanism, probably an accretion disc surrounding the hot component of the system. Over 16 yr (between 1985 and 2001) the general trend is that these jets are seen …
EUV Spectroscopic Observations of Spray Ejecta from an X2 Flare
Mason, H. E.; Pike, C. D.
An X2.3 class flare was reported on 10 April 2001 in AR 9415. A halo coronal mass ejection (CME) was associated with this flare. The Coronal Diagnostic Spectrometer (CDS) on board the Solar and Heliospheric Observatory (SOHO), which was running in its daily synoptic mode, recorded a very high-velocity ejection of plasma associated with this activi…
The Spectral Energy Distribution of the Seyfert Galaxy Ton S180
Zheng, W.; Turner, T. J.; Kraemer, S. B. +14 more
We present spectral results from a multisatellite, broadband campaign on the narrow-line Seyfert 1 galaxy Ton S180 (PHL 912) performed at the end of 1999. We discuss the spectral energy distribution (SED) of the source, combining simultaneous Chandra, ASCA, and Extreme Ultraviolet Explorer data with contemporaneous Far Ultraviolet Spectroscopic Ex…