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ISO-SWS Spectra of AGB Stars
Waters, L. B. F. M.; Justtanont, K.; Yamamura, I. +1 more
In this contribution, we present a few highlights of the guaranteed time program to observe AGB stars with differing chemical compositions and mass loss rates using ISO1 SWS. We briefly discuss C2H2 absorption in C-stars and O-rich stars with the 13 µm dust emission.
The eclipsing AM Herculis binary V2301 Ophiuchi. I. ROSAT & IUE observations.
Burwitz, V.; Beuermann, K.; de Martino, D. +2 more
We present X-ray and UV observations of the unique eclipsing cataclysmic variable V2301 Oph (1H1752+081). The X-ray eclipse of the primary star is total and corresponds in phase with the optical eclipse of the white dwarf. The X-ray light curve shows a quasi-sinusoidal orbital ``hump'' typical of AM Her systems. The orbital phase at which the hump…
The winds of hot close binaries. Paper 3: HD 159176
Stickland, D. J.; Pachoulakis, I.; Koch, R. H. +1 more
NICMOS/HST Post-Perihelion Images of Comet Hale-Bopp in Outburst
Spinrad, H.; Schneider, G.; McCarthy, D. +5 more
Near-infrared images of comet Hale-Bopp (C/1995 O1) were obtained from NICMOS/HST on UT August 27–28, 1997, when the comet emerged from the 50 degree solar elongation limit at 2.99 AU from Earth. Diffraction-limited images were obtained with camera 2 filters centered at 1.87, 1.90, 2.04 and 2.22 µm with ∼0.2″ resolution (0.076″/pixel; 165 km…
The Effects of Coronal Mass Ejections on Galactic Cosmic Rays in the High Latitude Heliosphere: Observations from Ulysses' First Orbit
Kunow, H.; Bothmer, V.; Wibberenz, G. +2 more
During its first solar orbit, the Ulysses spacecraft detected several coronal mass ejections (CMEs) at high heliographic latitudes. The authors present first observations on the effects of these high latitude CMEs on galactic cosmic rays (GCRs) using measurements from the Kiel Electron Telescope (KET) which is part of the Cosmic Ray and Solar Part…
Performance of high-density cast silicon carbide in the extreme ultraviolet
Keski-Kuha, Ritva A. M.; Fleetwood, Charles M.; Robichaud, Joseph
A Compact Circumstellar Dust Envelope of an Evolved AGB Star IRC-10529
Izumiura, H.; Hashimoto, O.
We have made far-infrared mapping observations around a heavily mass losing evolved star IRC-10529 with ISO. It is found that IRC-10529 shows a very compact circumstellar dust envelope in the 60 and 90 µm images obtained by ISOPHOT. Such a small size of the circumstellar dust envelope indicates very short history of the present strong mass loss. I…
Near Infrared Imaging of the Proposed z=2 Cluster Behind CL 0939+4713 (Abell 851)
Hutchings, J. B.; Davidge, T. J.
We have obtained deep J and K' images of a 90 arcsec square field containing the z=2.0 QSO that is viewed through the z=0.4 rich cluster A851. Brightnesses of individual galaxies are measured from these data, and archival F702W WFPC2 images from HST. The results are used to construct 2-colour diagrams, colour-magnitude diagrams, and luminosity fun…
Emission Lines from Companion Galaxies of QSOs
Gnedin, Oleg Y.
Anticipating new spectroscopic studies of quasar companions, we calculate expected emission-line spectra for the companion galaxies. Under the assumption of isotropic photoionizing radiation, we predict equivalent widths for Hα, Hβ, [O III] λ5007, [O II] λ3727, [Ne III] λ3869, and Mg II λ2798 lines. We consider six quasars, two of which (PKS 2135-…
The de-censoring of the faint stars in TYCHO photometry.
Grenon, M.; Hog, E.; Halbwachs, J. L. +3 more
The Tycho catalogue provides astrometric and photometric data for more than 1 million stars. The derivation of the mean magnitudes of stars fainter than about 8mag required a dedicated treatment, in order to take into account the observations that were too faint for providing a measurable signal. This treatment, called "de-censoring", is based on …