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http://hdl.handle.net/20.500.12386/27796
Titolo: | The failed state transition of the ATOLL source GRS 1724-308 | Autori: | Tarana, A. CAPITANIO, FIAMMA COCCHI, MASSIMO |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 477 | Fascicolo: | 3 | Da pagina:: | 3353 | 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. | URI: | http://hdl.handle.net/20.500.12386/27796 | URL: | https://arxiv.org/pdf/1803.11350.pdf https://academic.oup.com/mnras/article/477/3/3353/4956539 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty816 | Bibcode ADS: | 2018MNRAS.477.3353T | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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