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- Title
The X-ray bursts within the 2010 outburst of the accreting millisecond X-ray pulsar SAX J1748.9-2021.
- Authors
Wu, Ziwei; Ding, Guoqiang; Li, Zhibing; Chen, Yupeng; Qu, Jinlu
- Abstract
With the observations from Rossi X-ray Timing Explorer, we search and study the X-ray bursts of accreting millisecond X-ray pulsar SAX J1748.9-2021 during its 2010 outburst. We find 13 X-ray bursts, including 12 standard type-I X-ray bursts and an irregular X-ray burst which lacks cooling tail. During the outburst, the persistent emission occurred at ∼(1-5)%M˙Edd<inline-graphic></inline-graphic>. We use a combination model of a blackbody (BB), a powerlaw, and a line component to fit the persistent emission spectra. Another BB is added into the combination model to account for the emission of the X-ray bursts due to the thermonuclear burning on the surface of the neutron star. Finally, we modify the combination model with a multiplicative factor fa<inline-graphic></inline-graphic>, plus a BB to fit the spectra during the X-ray bursts. It is found that the fa<inline-graphic></inline-graphic> is inversely correlated with the burst flux in some cases. Our analysis suggests that the ignition depth of the irregular X-ray burst is obviously smaller than those of the type-I X-ray bursts. We argue that the detected type-I X-ray bursts originate from helium-rich or pure-helium environment, while the irregular X-ray burst originates from the thermonuclear flash in a shallow ocean.
- Subjects
X-ray bursts; BLACKBODY radiation; HELIUM; THERMONUCLEAR fuels; FUSION reactor fuel
- Publication
Astrophysics & Space Science, 2018, Vol 363, Issue 7, p1
- ISSN
0004-640X
- Publication type
Article
- DOI
10.1007/s10509-018-3367-1