Showing papers by "A. C. Fabian published in 1976"
71 citations
TL;DR: In this paper, the authors discuss the temporal structure and spectrum of such an event, and suggest some future observational tests, as well as the temporal and spectrum properties of a neutron star crustquake.
Abstract: Up to 1039 ergs of elastic energy might be released in a neutron star crustquake. The sound waves produced by such a quake will transform into a shock near the surface owing to the dramatic decrease in density. A thin surface layer will then be blown off radiating γ-rays. We discuss the temporal structure and spectrum of such an event, and suggest some future observational tests.
20 citations
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TL;DR: The ability of the r-process to produce superheavy elements is very uncertain and the conditions necessary for superheavy element synthesis (β-decays occurring sufficiently slow that the n γ n equilibrium is not disturbed) are difficult to realise in astrophysical situations as mentioned in this paper.
Abstract: THE discovery1 of the superheavy elements 116, 124, and 126 raises the question of where these elements are likely to have been formed. The majority of the post-iron-peak nuclei are thought to have been produced in conditions of explosive nucleosynthesis (the r-process), particularly in conventional supernova explosions. The ability of the r-process to produce superheavy elements is, however, very uncertain2. The conditions necessary for superheavy element synthesis (β-decays occurring sufficiently slow that the n γ
γ n equilibrium is not disturbed) are difficult to realise in astrophysical situations. The n-process (J. B. Blake and D. N. Schramm, unpublished) requires less extreme conditions (the β decays are important) and may occur more often. The majority of the elements normally attributed to the r-process may have been synthesised in this way. Neutron-induced fission causes both processes to terminate at nuclei with high proton numbers, Z, but the n-process may allow it to reach the higher Z value.
2 citations
TL;DR: The transient X-ray source Ariel 1118-61 has a period of 6.75 min this paper, and the authors consider orbital and rotational origins for the periodicity.
Abstract: The transient X-ray source Ariel 1118-61 has a period of 6.75 min. We review possible models for the X-ray source and in particular we consider orbital and rotational origins for the periodicity. Finally we discuss the possible identification of Ariel 1181-61 with the Mira-type variable RS Cen.
2 citations
TL;DR: The MSSL X-ray detectors on Copernicus have been used to study a number of extragalactic objects and at least three classes of unresolved sources are found and suggest that accretion may be the dominant mechanism as mentioned in this paper.
Abstract: The MSSL X-ray detectors onCopernicus have been used to study a number of extragalactic objects. At least three classes of unresolved sources are found and we suggest that accretion may be the dominant mechanism. The mass of the accreting object then determines the X-ray emission properties.
1 citations