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dc.contributor.authorGaburov, Evghenii
dc.contributor.authorLombardi, James C. Jr
dc.contributor.authorPortegies Zwart, Simon
dc.date.accessioned2018-01-15T19:28:46Z
dc.date.available2018-01-15T19:28:46Z
dc.date.issued2007-09-21
dc.identifier.citationGaburov, E., Lombardi, J.C. Jr, Portegies Zwart, S. (2008). Mixing in massive stellar mergers. Month Notices of the Royal Astronomical Society 383: L5-L9. doi:10.1111/j.1745-3933.2007.00399.xen_US
dc.identifier.urihttp://hdl.handle.net/10456/45422
dc.description.abstractThe early evolution of dense star clusters is possibly dominated by close interactions between stars, and physical collisions between stars may occur quite frequently. Simulating a stellar collision event can be an intensive numerical task, as detailed calculations of this process require hydrodynamic simulations in three dimensions. We present a computationally inexpensive method in which we approximate the merger process, including shock heating, hydrodynamic mixing and mass loss, with a simple algorithm based on conservation laws and a basic qualitative understanding of the hydrodynamics of stellar mergers. The algorithm relies on Archimedes’ principle to dictate the distribution of the fluid in the stable equilibrium situation. We calibrate and apply the method to mergers of massive stars, as these are expected to occur in young and dense star clusters. We find that without the effects of microscopic mixing, the temperature and chemical composition profiles in a collision product can become double-valued functions of enclosed mass. Such an unphysical situation is mended by simulating microscopic mixing as a post-collision effect. In this way we find that head-on collisions between stars of the same spectral type result in substantial mixing, while mergers between stars of different spectral type, such as type B and O stars (∼10 and ∼40 M respectively), are subject to relatively little hydrodynamic mixing. Our algorithm has been implemented in an easy-to-use software package, which we have made publicly available for download.en_US
dc.language.isoen_USen_US
dc.publisherOxford University Pressen_US
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen_US
dc.relation.isversionofhttps://doi.org/10.1111/j.1745-3933.2007.00399.xen_US
dc.rightsThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2008 Gaburov, Lombardi, and Portegies Zwart Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.en_US
dc.subjecthydrodynamicsen_US
dc.subjectmolecular processesen_US
dc.subjectshock wavesen_US
dc.subjectmethods: numericalen_US
dc.subjectblue stragglersen_US
dc.subjectstars: generalen_US
dc.titleMixing in massive stellar mergersen_US
dc.description.versionPublished articleen_US
dc.contributor.departmentPhysicsen_US
dc.citation.volume383en_US
dc.citation.issue1en_US
dc.citation.spageL5en_US
dc.citation.epageL9en_US
dc.identifier.doi10.1111/j.1745-3933.2007.00399.x
dc.contributor.avlauthorLombardi, James C. Jr


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