Explosive H-burning, the rp-process, and X-ray bursts

Thielemann, F. K. and Schatz, H. and Rauscher, T. and Rembges, J. F. and Gorres, J. and Wiescher, M. and Bildsten, L.. (1998) Explosive H-burning, the rp-process, and X-ray bursts. In: Stellar evolution, stellar explosions, and galactic chemical evolution : proceedings of the 2nd Oak Ridge Symposium on Atomic and Nuclear Astrophysics, Oak Ridge, Tennessee, 2-6 December 1997. Bristol ; Philadelphia, pp. 483-494.

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Official URL: http://edoc.unibas.ch/dok/A5839338

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The major astrophysical events which involve explosive H-burning are novae and type I X-ray bursts. Both are related to binary stellar systems with hydrogen accretion from a binary companion onto a compact object, and the explosive ignition of the accreted H-layer. High densities cause the pressure to be dominated by the degenerate electron gas, preventing a stable and controlled burning. In the case of novae the compact object is a white dwarf, in the case of X-ray bursts it is a neutron star. Explosive II-burning in novae has been discussed in many recent articles [1, 2, 3, 4, 5]. Its processing is limited due to maximum temperatures of similar to 3X10(8)K. Only in X-ray bursts temperatures larger than 4x10(8)K are possible, which permit a break-out from the hot CNO-cycle, leading to a further temperature increase beyond 10(9)K, the onset of an rp-process (a sequence of proton captures and beta-decays) and burning of H and He to Fe/Ni and beyond. Here we investigate the rp-process by making use of a complete and updated nuclear reaction network from H to Sn. In particular we consider 2p-capture reactions that can bridge proton unbound nuclei and therefore accelerate the reaction flow. In a simplified one dimensional, one-cone X-ray burst model we find that for a 25 s burst the reaction flow reaches Cd. The consequences for energy production, final composition of the ashes, and fuel consumption are discussed.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Conference or Workshop Item, refereed
Conference or workshop item Subtype:Conference Paper
Publisher:Institute of Physics Pub.
Note:Publication type according to Uni Basel Research Database: Conference paper
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Last Modified:08 Jun 2012 06:54
Deposited On:08 Jun 2012 06:33

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