Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...482..178c&link_type=abstract
Astrophysical Journal v.482, p.178
Astronomy and Astrophysics
Astronomy
6
Accretion, Accretion Disks, Instabilities, X-Rays: Bursts
Scientific paper
We examine recent time-dependent accretion disk calculations by Cannizzo that attempt to reproduce the giant bursts in GRO J1744-28 and find that the fluctuations that precede the main burst resemble the fluctuations that were observed in GRO J1744-28 toward the end of the time during which the giant bursts were seen. The calculations by Cannizzo were tuned to be at a rate of accretion slightly greater than the critical rate M dot _{{crit}} that divides steady and bursting behavior. This tuning leads to a near balance between the heating and cooling rates within the accretion disk such that oscillations slowly develop and grow, eventually becoming unbounded and producing a global instability. The fact that an increase in the amplitude of the interburst oscillations was seen in GRO J1744-28 most strongly during the late epoch of the time of several months covering the giant bursts is consistent with the mass accretion rate onto the pulsar decreasing and approaching M dot _{{crit}}.
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