期刊
ASTROPHYSICAL JOURNAL
卷 883, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab3a37
关键词
accretion, accretion disks; stars: individual (4U 1608-52); stars: neutron; X-rays: binaries; X-rays: bursts
资金
- NASA through the NICER mission
- European Union [713683]
- National Science Foundation [PHY-1430152]
- Royal Society
- NASA through the Astrophysics Explorers Program
We report for the first time below 1.5 keV, the detection of a secondary peak in an Eddington-limited thermonuclear X-ray burst observed by the Neutron Star Interior Composition Explorer (NICER) from the low-mass X-ray binary 4U 1608-52. Our time-resolved spectroscopy of the burst is consistent with a model consisting of a varying-temperature blackbody, and an evolving persistent flux contribution, likely attributed to the accretion process. The dip in the burst intensity before the secondary peak is also visible in the bolometric flux. Prior to the dip, the blackbody temperature reached a maximum of approximate to 3 keV. Our analysis suggests that the dip and secondary peak are not related to photospheric expansion, varying circumstellar absorption, or scattering. Instead, we discuss the observation in the context of hydrodynamical instabilities, thermonuclear flame spreading models, and reburning in the cooling tail of the burst.
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