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Session 48 - New Insights on X-ray Binaries - II.
Oral session, Wednesday, June 11
North Main Hall C/D,

[48.02] GRO J1744-28 vs the Rapid Burster

W. H. G. Lewin (MIT)

The bursts from GRO J1744-28 are due to accretion instabilities as is the case for type II bursts in the Rapid Burster. Both sources are transient Low-Mass X-ray Binaries, and they both exhibit an unusual oscillation (QPO) in their persistent X-ray flux following several (not all) of the type II bursts. There are differences too. The pattern of bursts and the burst peak luminosities are very different for the two sources, and the QPO centroid frequencies (see above) differ by an order of magnitude. The difference in behavior probably lies in the difference in the magnetic dipole field strength of the accreting neutron stars. It remains puzzling, why GRO J1744-28 and the Rapid Burster are the only known sources which exhibit rapidly repetitive type II bursts (time intervals between bursts in the Rapid Burster can be as little as 10 sec, in 1744-28 the shortest repetitive burst intervals are approximately 200 sec).

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