Close-binary evolution - I. Tidally induced shear mixing in rotating binaries
H. F. Song,H. F. Song,H. F. Song,André Maeder,G. Meynet,R. Q. Huang,Sylvia Ekström,Anahí Granada +7 more
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In this paper, the authors studied how tides in a binary system induce some specific internal shear mixing that can substantially modify the evolution of close binaries prior to mass transfer, and they constructed numerical models accounting for tidal interactions, meridional circulation, transport of angular momentum, shears and horizontal turbulence.Abstract:
Context. Tides are known to play an important role in binary evolution, leading in particular to synchronization of axial and orbital rotations and to binary mass transfer. Aims. We study how tides in a binary system induce some specific internal shear mixing that can substantially modify the evolution of close binaries prior to mass transfer. Methods. We constructed numerical models accounting for tidal interactions, meridional circulation, transport of angular momentum, shears and horizontal turbulence. Furthermore, we considered a variety of orbital periods and initial rotation velocities. Results. Depending on orbital periods and rotation velocities, tidal effects may spin down (spin-down case) or spin up (spin-up case) the axial rotation. In both cases, tides may induce a high internal differential rotation. The resulting tidally induced shear mixing is so efficient that the internal distributions of angular velocity and chemical elements are highly influenced. The evolutionary tracks are modified, and in for spin down as well as for spin up, large amounts of nitrogen can be transported to the stellar surfaces before any binary mass transfer. Meridional circulation, when properly treated as a advection, always tends to counteract the tidal interaction, tending to spin up the surface when it is braked down and vice versa. As a consequence, the times needed for the axial angular velocity to become equal to the orbital angular velocity may be longer than given by typical synchronization timescales. Moreover, because of the meridional circulation some differential rotation remains in tidally locked binary systems.read more
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Merging binary black holes formed through chemically homogeneous evolution in short-period stellar binaries
Ilya Mandel,Selma E. de Mink +1 more
TL;DR: In this article, the authors explore a newly proposed channel to create binary black holes of stellar origin, where mixing induced by rotation and tides transports the products of hydrogen burning throughout the stellar envelopes.
Journal ArticleDOI
The MiMeS survey of magnetism in massive stars: CNO surface abundances of Galactic O stars
Fabrice Martins,A. Hervé,J. C. Bouret,W. L. F. Marcolino,Gregg A. Wade,Coralie Neiner,Evelyne Alecian,Evelyne Alecian,Jason Grunhut,Véronique Petit +9 more
TL;DR: In this paper, the authors used a sample of 74 objects comprising all luminosity classes and spectral types from O4 to O9.7 and determined the surface properties of the sample stars, with special emphasis on abundances of carbon, nitrogen and oxygen.
Journal ArticleDOI
The MiMeS Survey of Magnetism in Massive Stars: CNO surface abundances of Galactic O stars
Fabrice Martins,A. Hervé,Jean-Claude Bouret,W. L. F. Marcolino,Gregg A. Wade,C. Neiner,Evelyne Alecian,Jason Grunhut,Véronique Petit +8 more
TL;DR: In this paper, the surface properties of the sample stars, with special emphasis on abundances of carbon, nitrogen and oxygen, were determined, and it was shown that nitrogen is more enriched and carbon/oxygen more depleted in supergiants than in dwarfs.
Journal ArticleDOI
The spin of the second-born black hole in coalescing binary black holes
Ying Qin,Tassos Fragos,Tassos Fragos,Georges Meynet,Jeff J. Andrews,Jeff J. Andrews,Mads Peter Sørensen,H. F. Song,H. F. Song,H. F. Song +9 more
TL;DR: In this paper, the spin angular momentum evolution of the helium star was studied to constrain the spin of the second-born black hole in order to understand the binary black hole's spin.
Journal ArticleDOI
The spin of the second-born black hole in coalescing binary black holes
Ying Qin,Tassos Fragos,Tassos Fragos,Georges Meynet,Jeff J. Andrews,Jeff J. Andrews,Mads Peter Sørensen,H. F. Song,H. F. Song,H. F. Song +9 more
TL;DR: In this paper, a detailed binary evolution and systematically explore the parameter space of initial binary properties, including initial black hole and helium star masses, initial rotation of the helium star as well as metallicity.
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