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Article
Cigar, pipe, and cigarette smoking and bladder cancer risk in European men
Objective: Estimating the risk of bladder cancer from cigar and pipe smoking is complicated by a small number of non-cigarette smokers included in most relevant studies.
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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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Article
The O/C abundance ratio in absorbing gas clouds at high redshift
THE intrinsic extreme ultraviolet (EUV) spectrum of quasars, in which spectral lines of He and CNO ions should appear, is in most cases strongly absorbed by the hydrogen Lyman continuum of intergalactic matter...
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Chapter
Urinary Calcium After Oral Glucose Ingestion in Calcium Stone Formers: A Simple Provocative Test for Predicting Stone Recurrence
Although the various metabolic abnormalities underlying Ca stone disease have been extensively studied, none of these except abnormalities in 24-h urine samples appear to be of any practical significance as pr...
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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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Article
The progenitor of SN1987A
One of the reasons why the bright supernova SN1987A is of such importance is the fact that its proximity would allow for the first time, the identification of a supernova progenitor star. Attempts to establis...
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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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Article
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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Article
Narrow and variable lines in the ultraviolet spectrum of the Seyfert galaxy NGC4151
The Seyfert galaxy NGC4151 observed when the nucleus is at a minimum has two emission lines of full width at half maximum <7 and 16 Å respectively and varying in intensity by a factor of three in 10 days. Thes...
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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...