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• W3102330247 startingPage "417" @default.
• W3102330247 abstract "Recent theoretical and observational studies have shown that ashes from thermonuclear burning may be ejected during radius-expansion bursts, giving rise to photoionisation edges in the X-ray spectra. We report a search for such features in Chandra spectra observed from the low-mass X-ray binary 4U 1728-34. We analysed the spectra from four radius-expansion bursts detected in 2006 July, and two in 2002 March, but found no evidence for discrete features. We estimate upper limits for the equivalent widths of edges of a few hundred eV, which for the moderate temperatures observed during the bursts, are comparable with the predictions. During the 2006 July observation 4U 1728-34 exhibited weak, unusually frequent bursts (separated by <2 hr in some cases), with profiles and alpha-values characteristic of hydrogen-poor fuel. Recurrence times as short as those measured are insufficient to exhaust the accreted hydrogen at solar composition, suggesting that the source accretes hydrogen deficient fuel, for example from an evolved donor. The detection for the first time of a 10.77 min periodic signal in the persistent intensity, perhaps arising from orbital modulation, supports this explanation, and suggests that this system is an ultracompact binary similar to 4U 1820-30." @default.
• W3102330247 created "2020-11-23" @default.
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• W3102330247 date "2010-11-02" @default.
• W3102330247 modified "2023-10-04" @default.
• W3102330247 title "RADIUS-EXPANSION BURST SPECTRA FROM 4U 1728–34: AN ULTRACOMPACT BINARY?" @default.
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• W3102330247 doi "https://doi.org/10.1088/0004-637x/724/1/417" @default.
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