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  • 11
    Electronic Resource
    Electronic Resource
    Periodic X-ray outbursts from A0535+26, 2S1145-619 and GX301-2 (1981)
    Springer
    Space science reviews 30 (1981), S. 461-466 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report Ariel V(SSI) observations of three X-ray pulsars A0535+26, 2S1145-619 and GX301-2 (2S1223-624). These sources exhibit X-ray outbursts which appear, on the basis of observations extending over ∼ 5 years, to have recurrence periods of 110 days, 187.5 days and 41.4 days respectively. If these periods are orbital in origin, the observed X-ray modulation may be explained in terms of an appreciable orbital eccentricity giving rise to time variable accretion. (In the case of GX301-2 published pulse timing data already provide independent evidence for a 41.4 day orbital period and an eccentricity e ≈ 0.4). The optical counterparts are all early-type stars; A0535+26 and 2S1145-619 are identified with Be main sequence stars and GX301-2 with a B2 supergiant which also shows an emission line spectrum. The implications of the observations in relation to possible mass transfer mechanisms in such systems are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01246065
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    Paper (German National Licenses)
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  • 12
    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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  • 13
    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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  • 14
    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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  • 15
    Electronic Resource
    Electronic Resource
    Einstein observations of the galactic centre (1981)
    Springer
    Space science reviews 30 (1981), S. 293-299 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01246034
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    Paper (German National Licenses)
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