A non-PRE double-peaked burst from 4U 1636-536: evidence for burning front propagation

Details A non-PRE double-peaked burst from 4U 1636-536: evidence for burning front propagation A non-PRE double-peaked burst from 4U 1636-536: evidence for burning front propagation

2005-09-14

arxiv.org/abs/astro-ph/0509369v2

Astrophys.J.636:L121-L124,2006

Astronomy and Astrophysics

Astrophysics

11 pages, 2 figures, refereed version, accepted for publication in ApJ Letters

Scientific paper

10.1086/500199

We analyse Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) data of a double-peaked burst from the low mass X-ray binary (LMXB) 4U 1636--536 that shows no evidence for photospheric radius expansion (PRE). We find that the X-ray emitting area on the star increases with time as the burst progresses, even though the photosphere does not expand. We argue that this is a strong indication of thermonuclear flame spreading on the stellar surface during such bursts. We propose a model for such double-peaked bursts, based on thermonuclear flame spreading, that can qualitatively explain their essential features, as well as the rarity of these bursts.

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