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The failed state transition of the ATOLL source GRS 1724-308

Journal
Date Issued
2018
Author(s)
Tarana, A.
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•
DOI
Abstract
The 2004-2012 X-ray time history of the NS LMXB GRS 1724-308 shows, along with the episodic brightenings associated with the low-high state transitions typical of the ATOLL sources, a peculiar, long lasting (∼300 d) flaring event, observed in 2008. This rare episode, characterized by a high-flux hard state, has never been observed before for GRS 1724-308, and in any case is not common among ATOLL sources. We discuss here different hypotheses on the origin of this peculiar event that displayed the spectral signatures of a failed transition, similar in shape and duration to those rarely observed in black hole binaries. We also suggest the possibility that the atypical flare occurred in coincidence with a new rising phase of the 12-yr superorbital modulation that has been previously reported by other authors. The analysed data also confirm for GRS 1724-308 the already reported orbital period of ∼90 d.
Volume
477
Issue
3
Start page
3353
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2018MNRAS.477.3353T
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open.access
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