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Type I X-ray Bursts at Low Accretion Rates

Peng, Fang and Brown, Edward F. and Truran, James W. (2007) Type I X-ray Bursts at Low Accretion Rates. In: The multicolored landscape of compact objects and their explosive origins : Cefalu, Sicily, 11-24 June 2006. AIP Conference Proceedings. No.924. American Institute of Physics , Melville, NY, pp. 513-518. ISBN 978-0-7354-0434-2.

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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).

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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.
Funding AgencyGrant Number
NSFPHY 02-16783
Department of Energy (DOE)B523820
Department of Energy (DOE)W-31-109-ENG-38
Subject Keywords:X-ray sources (astronomical); neutron stars; accretion
Series Name:AIP Conference Proceedings
Issue or Number:924
Record Number:CaltechAUTHORS:PENaipcp07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8663
Deposited By: Archive Administrator
Deposited On:03 Sep 2007
Last Modified:02 Oct 2019 23:53

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