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Chapter
ISO Observations of Symbiotic Stars
A number of symbiotic stars have been observed with ISO. In addition to a number of emission lines, SWS observations of the symbiotic novae RR Tel and V1016 Cyg reveal prominent, broad 10 & 18 µm silicate dust fe...
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Chapter
ISO Observations of Classical Novae
We describe the ISO programme to observe classical novae. The programme includes observations of novae during and shortly after eruption, and old novae. ISO observations of far infrared fine structure lines ar...
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Article
ISO Observations of Symbiotic Stars
A number of symbiotic stars have been observed with ISO. In addition to a number of emission lines, SWS observations of the symbiotic novae RR Tel and V1016 Cyg reveal prominent, broad 10 & 18 µm silicate dust...
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Article
ISO Observations of Classical Novae
We describe the ISO programme to observe classical novae. The programme includes observations of novae during and shortly after eruption, and old novae. ISO observations of far infrared fine structure lines ar...
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Chapter and Conference Paper
High-Resolution Spectroscopy of the Bright Quasar HS 1946+7658
The optical spectrum of the QSO HS 1946+7658 (z em = 3.05) has been observed at high resolution (b ~ 15km/s) in the wavelength interval 4115 – 4970Å. Th...
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Chapter and Conference Paper
The Lyα Forest towards HS1700+6416 at High Resolution
We have analyzed high resolution (b ≈ 15 km/s) optical spectra of the QSO HS1700+6416 (z em = 2.72). The high S/N ratio in the Lyα forest allows a reasonable de...
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Chapter and Conference Paper
Metal Line Absorptions Toward the QSO HS1700+6416
We have analyzed high resolution (b ≈ 15 km/s) and low resolution (R ≈ 3Å) optical spectra of the QSO HS1700+6416 (z em = 2.72) taken with the ISIS spectrograph at the WHT. We are able to ...
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Chapter
The International AGN Watch: A Multiwavelength Monitoring Consortium
The International AGN Watch, an informal consortium of over 100 astronomers, was established to coordinate multiwavelength monitoring of a limited number of active galactic nuclei and thus obtain comprehensive...
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Chapter
The Infrared Space Observatory (ISO)
The Infrared Space Observatory (ISO) is a three axis stabilized satellite designed to observe astronomical sources in the range 2.5–200 µm. It contains a cryogenically cooled telescope feeding four focal plane in...
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Chapter and Conference Paper
The Iue Ultraviolet Spectrum of PC 11
PC 11 (HD 149427, PK 331–5 1) is classified as a young planetary nebula with strong OIII 4363Å and a Zanstra temperature of T Z = 27000K. It is also classified as (D’ - type) ye...
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Chapter and Conference Paper
FeII and Balmer continuum emission in AGNs
We address in this short note a different aspect of the FeII problem in AGNs, one connected with treating the total FeII emission as a form of “continuum” rather than emission lines. The justification for this...
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Chapter
Discovery of Narrow and Variable Lines in the Ultraviolet Spectrum of the Seyfert Galaxy NGC 4151, and an Outline of Our Previous Results
Extensive observations of NGC 4151 when the nucleus is at a minimum have led to the discovery of two emission lines which have a full width at half maximum of less than 7 and 16 Å respectively (after correctio...
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Chapter
T Cor B, a “Seyfert 1 Nucleus” at 1200±100 Parsecs?
Several symbiotic stars are characterized by UV spectral signatures which are similar, in several aspects, to those observed in the broad-line region of Seyfert galaxies. We suggest to consider the symbiotic s...
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Chapter and Conference Paper
Simultaneous Exosat-IUE Observations of NGC 4151
NGC 4151 was observed four times in Nov. 83. The results indicate that: a) there exists a correlation between the X-ray and UV fluxes on the long term; b) the soft X-ray excess between 0.1 and 1 keV is probabl...
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Chapter and Conference Paper
Ultraviolet, Optical and X-Ray Monitoring of the Continuum of NGC 4151
The nucleus of the Seyfert galaxy NGC 4151 has been extensively monitored with the International Ultraviolet Explorer (IUE) in the wave- length range 1200–3000 Å, a region of the spectrum where the contaminati...