Spontaneous fission on the Ap star HR465

Details Spontaneous fission on the Ap star HR465 Spontaneous fission on the Ap star HR465

Jun 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974natur.249..532o&link_type=abstract

Nature, Volume 249, Issue 5457, pp. 532-533 (1974).

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Scientific paper

THERE is an anomalously high abundance of heavy elements on the Cr-Eu subgroup on the Ap star HR465 (refs 1-3). The overall abundance pattern of elements with Z≳40 indicates that the heavy elements originate from r-process nucleosynthesis3. In the r-process abundance curve there is a broad peak in the rare earth region centred around Z bumpe 65 (A bumpe 165). The rare earth elements on HR465, however, produce a peak centring near neodymium and samarium at Z = 60~62 (ref. 3); this clearly differs from the trend of the r-abundance pattern. Nor does the rare earth peak on HR465 correspond to the s-process abundance peak around barium and lanthanum (A = 135~140). Moreover the amount of barium on this star is too small to produce this rare earth peak by the local r-process, which begins from the s-process peak of barium and lanthanum4. Other explanations for the overabundance of rare earth elements on Ap stars do not seem appropriate for HR465 (ref. 1). I examine here an alternative possibility-that the rare earth anomaly on HR465 originates from asymmetric spontaneous fission.

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