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          Institute: MPI für Astrophysik     Collection: High Energy Astrophysics at MPA     Display Documents

ID: 10842.0, MPI für Astrophysik / High Energy Astrophysics at MPA
Hydrodynamical simulations of the stream-core interaction in the slow merger of massive stars
Authors:Ivanova, N.; Podsiadlowski, P.; Spruit, H.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. Roy. Astron. Soc.
Issue / Number:4
Start Page:819
End Page:832
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present detailed simulations of the interaction of a stream emanating from a mass-losing secondary with the core of a massive supergiant in the slow merger of two stars inside a common envelope. The dynamics of the stream can be divided into a ballistic phase, starting at the L-1 point, and a hydrodynamical phase, where the stream interacts strongly with the core. Considering the merger of a 1- and 5-M-circle dot star with a 20-M-circle dot evolved supergiant, we present two- dimensional hydrodynamical simulations using the prometheus code to demonstrate how the penetration depth and post-impact conditions depend on the initial properties of the stream material (e.g. entropy, angular momentum, stream width) and the properties of the core (e.g. density structure and rotation rate). Using these results, we present a fitting formula for the entropy generated in the stream-core interaction and a recipe for the determination of the penetration depth based on a modified Bernoulli integral.
Free Keywords:hydrodynamics; nuclear reactions; nucleosynthesis; abundances; binaries : close
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England; Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England; Max Planck Inst Astrophys, D-85741 Garching, Germany
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