Rigidly rotating, incompressible spheroid-ring systems: new bifurcations, critical rotations and degenerate states
Language
en
Article de revue
This item was published in
Monthly Notices of the Royal Astronomical Society. 2019-06-19, vol. 487, n° 4, p. 4504-4509
Oxford University Press (OUP): Policy P - Oxford Open Option A
English Abstract
The equilibrium of incompressible spheroid-ring systems in rigid rotation is investigated by numerical means for a unity density contrast. A great diversity of binary configurations is obtained, with no limit neither in ...Read more >
The equilibrium of incompressible spheroid-ring systems in rigid rotation is investigated by numerical means for a unity density contrast. A great diversity of binary configurations is obtained, with no limit neither in the mass ratio, nor in the orbital separation. We found only detached binaries, meaning that the end-point of the ɛ2-sequence is the single binary state in strict contact, easily prone to mass-exchange. The solutions show a remarkable confinement in the rotation frequency-angular momentum diagram, with a total absence of equilibrium for Ω2/πGρ ≳ 0.21. A short band of degeneracy is present next to the one-ring sequence. We unveil a continuum of bifurcations all along the ascending side of the Maclaurin sequence for eccentricities of the ellipsoid less than ≈0.612 and which involves a gradually expanding, initially massless loop.Read less <
English Keywords
Methods: numerical
Gravitation
stars: interiors
stars: rotation
Methods: analytical
Origin
Hal imported