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  • 1985-1989  (8)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    An X-ray corona in SS Cygni? (1985)
    [s.l.] : Nature Publishing Group
    Nature 313 (1985), S. 290-291 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The EXOSAT2 observations of SS Cygni were made on 1984 December 4. SS Cygni was detected in both the medium energy (ME) experiment3 (2-20 keV; 'hard' X rays) and the Channel Multiplier Array (CMA)4 (0.04-2 keV; 'soft' X rays) at flux levels similar to those measured previously in quiescence (ref. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/313290a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Low-frequency divergent X-ray variability in the Seyfert galaxy NGC4051 (1987)
    [s.l.] : Nature Publishing Group
    Nature 325 (1987), S. 694-696 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] NGC4051 was observed by EXOSAT for 62 h in December 1985, achieving a three-cr detection approximately every 50 s. Figure 1 shows the X-ray light curve, summed in 1,000-s bins. Variability is chaotic, and visually reminiscent of Cygnus X-l7. The flux ranges over a factor of 10, including a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/325694a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The galactic ridge observed by Exosat (1985)
    [s.l.] : Nature Publishing Group
    Nature 317 (1985), S. 218-221 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have used Exosat to map the distribution of X-ray emission in the galactic plane. In addition to numerous point sources, the map reveals a narrow continuous ridge of emission which extends along the galactic plane either side of the galactic centre out to ∼40° longitude. The origin of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/317218a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    2A0526-328: The white dwarf rotation period revealed (1985)
    Springer
    Space science reviews 40 (1985), S. 121-126 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report results from EXOSAT observations of the intermediate polar system 2A0526-328 (TV Col). The hard X-ray emission (2–8 keV) is modulated with a period of 1943 s, interpreted as the white-dwarf rotation period. Soft and hard X-ray emission show intensity minima, in phase with the orbital period of 0.2286 days; analysis of the hard X-ray spectra shows that these minima are caused by an extra low-energy absorption corresponding to a H column density of 4 × 1022 cm-2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212874
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The big dipper: 4U1624-49 (1985)
    Springer
    Space science reviews 40 (1985), S. 195-200 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a 6.3 hour observation of 4U1624-49 with the EXOSAT Medium Energy experiment. The X-ray light curve is dominated by a series of sharp dips in which the observed flux falls to ∼25% of the steady level on timescales of seconds. These dips are accompanied by strong variations in the spectral hardness consistent with large changes in the absorbing column density. No evidence is found for any dip periodicity, in contrast to the other four sources in which dip activity has been reported. We discuss the implications of these observations for models of low mass X-ray binaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212884
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    SS Cygni in outburst and quiescence (1985)
    Springer
    Space science reviews 40 (1985), S. 127-133 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract EXOSAT has been used to carry out a series of observations of the dwarf nova SS Cygni covering both quiescent and outburst states which provide a detailed picture of its behaviour at X-ray wavelengths. These results provide strong support for a new coronal model for the X-ray emission from non-magnetic white dwarf systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212875
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    EXOSAT observations of the X-ray pulsar 4U1145-619 (1985)
    Springer
    Space science reviews 40 (1985), S. 429-432 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract EXOSAT observations of the X-ray pulsar 4U1145-619 during June and July 1983 and July 1984 confirm that this source shows a regular 187 day outburst cycle in X-rays. The results from pulse timing and X-ray spectroscopy are discussed in terms of a model for 4U1145-619 involving an eccentric binary system in which there is variable accretion from the Be primary star onto a companion neutron star.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00179852
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    A new view of the galactic plane with EXOSAT (1985)
    Springer
    Space science reviews 40 (1985), S. 437-441 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new X-ray image of the galactic plane has been produced using the 45 arcmin square field of view of the Medium Energy Instrument on EXOSAT. This image shows a total of 64 sources including 18 new ones which include the first observation of persistent emission from the globular cluster bursters Terzan 1 and Terzan 5. The most important discovery from this image is a 2° wide ridge of diffuse emission symmetrical about the plane and extending from the galactic centre to 1″=±40°. The spectrum of this emission appears to be hard (α ∼ 1.2) with no significant absorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00179854
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    Paper (German National Licenses)
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