RADIUS-EXPANSION BURST SPECTRA FROM 4U 1728-34: AN ULTRACOMPACT BINARY?

@article{Galloway2010RADIUSEXPANSIONBS,
  title={RADIUS-EXPANSION BURST SPECTRA FROM 4U 1728-34: AN ULTRACOMPACT BINARY?},
  author={Duncan K. Galloway and Yangsen Yao and Herman L. Marshall and Zdenka Misanovic and Nevin Weinberg Monash University and Australia. and University of Colorado and Mit and U. California Berkeley},
  journal={The Astrophysical Journal},
  year={2010},
  volume={724},
  pages={417-424}
}
Recent theoretical and observational studies have shown that ashes from thermonuclear burning may be ejected during radius-expansion bursts, giving rise to photoionization 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 analyzed 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… Expand

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