Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-28
Astron.Astrophys.467:L33,2007
Astronomy and Astrophysics
Astrophysics
5 pages, 4 figures, accepted for publication in A&A Letters
Scientific paper
10.1051/0004-6361:20077326
Most Type I X-ray bursts from accreting neutron stars have a lightcurve with a single peak, but there is a rare population of faint bursts that are double or even triple peaked. Suggested mechanisms include polar ignition with equatorial stalling, or multi-step energy release; the latter being caused by hydrodynamic instabilities or waiting points in the nuclear reaction sequence. We present an analysis of the accretion rate dependence of the multi-peak bursts, and discuss the consequences for the various models. The observations pose particular challenges for the polar ignition mechanism given current models of ignition latitude dependence.
Maurer Immanuel
Watts Anna L.
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