Published August 21, 2007
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Type I X-ray Bursts at Low Accretion Rates
Abstract
Neutron stars, with their strong surface gravity, have interestingly short timescales for the sedimentation of heavy elements. Recent observations of unstable thermonuclear burning (observed as X-ray bursts) on the surfaces of slowly accreting neutron stars (< 0.01 of the Eddington rate) motivate us to examine how sedimentation of CNO isotopes affects the ignition of these bursts. We further estimate the burst development using a simple one-zone model with a full reaction network. We report a region of mass accretion rates for weak H flashes. Such flashes can lead to a large reservoir of He, the unstable burning of which may explain some observed long bursts (duration ~ 1000 s).
Additional Information
© 2007 American Institute of Physics. This work is supported in part by the Joint Institute for Nuclear Astrophysics under NSF-PFC grant PHY 02-16783, and by the Department of Energy under grant B523820 to the Center for Astrophysical Thermonuclear Flashes at the University of Chicago. EFB is supported by the NSF under grant AST-0507456; JWT acknowledges support from the U.S. DOE, under contract No. W-31-109-ENG-38.Attached Files
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Additional details
- Eprint ID
- 8663
- Resolver ID
- CaltechAUTHORS:PENaipcp07
- PHY 02-16783
- NSF
- B523820
- Department of Energy (DOE)
- AST-0507456
- NSF
- W-31-109-ENG-38
- Department of Energy (DOE)
- Created
-
2007-09-03Created from EPrint's datestamp field
- Updated
-
2023-06-01Created from EPrint's last_modified field
- Series Name
- AIP Conference Proceedings
- Series Volume or Issue Number
- 924