Equilibrium and stability of supermassive stars in binary systems
- 6 June 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 64 (2), 024004
- https://doi.org/10.1103/physrevd.64.024004
Abstract
We investigate the equilibrium and stability of supermassive stars of mass in binary systems. We find that corotating binaries are secularly unstable for close, circular orbits with where r is the orbital separation and R the stellar radius. We also show that corotation cannot be achieved for distant orbits with since the time scale for viscous angular momentum transfer associated with tidal torques is longer than the evolution time scale due to emission of thermal radiation. These facts suggest that the allowed mass range and orbital separation for corotating supermassive binary stars is severely restricted. In particular, for supermassive binary stars of large mass corotation cannot be achieved, as viscosity is not adequate to mediate the transfer between orbital and spin angular momentum. One possible outcome for binary supermassive stars is the onset of quasi-radial, relativistic instability which drives each star to collapse prior to merger: We discuss alternative outcomes of collapse and possible spin states of the resulting black holes. We estimate the frequency and amplitude of gravitational waves emitted during several inspiral and collapse scenarios.
Keywords
This publication has 26 references indexed in Scilit:
- Evolution of Differentially Rotating Supermassive Stars to the Onset of Bar InstabilityThe Astrophysical Journal, 2001
- Evolution of Rotating Supermassive Stars to the Onset of CollapseThe Astrophysical Journal, 1999
- Collapse of primordial gas clouds and the formation of quasar black holesThe Astrophysical Journal, 1994
- GRAVITATIONAL-WAVES FROM MERGING COMPACT BINARIES - HOW ACCURATELY CAN ONE EXTRACT THE BINARYS PARAMETERS FROM THE INSPIRAL WAVE-FORMPhysical Review D, 1994
- Spin-up of a rapidly rotating star by angular momentum loss - Effects of general relativityThe Astrophysical Journal, 1992
- The dynamical evolution of dense star clusters in galactic nucleiThe Astrophysical Journal, 1990
- The collapse of dense star clusters to supermassive black holes - The origin of quasars and AGNsThe Astrophysical Journal, 1985
- Black Hole Models for Active Galactic NucleiAnnual Review of Astronomy and Astrophysics, 1984
- Black Holes, White Dwarfs, and Neutron StarsPublished by Wiley ,1983
- The Dynamical Instability of Gaseous Masses Approaching the Schwarzschild Limit in General Relativity.The Astrophysical Journal, 1964