ON THE RELEVANCE OF THE r-MODE INSTABILITY FOR ACCRETING NEUTRON STARS AND WHITE DWARFS

摘要: We present a case study for the relevance of r-mode instability accreting compact stars. Our estimates are based on approximations that facilitate back envelope calculations. discuss two different cases. (1) For recycled millisecond pulsars, we argue may be active at rotation periods longer than Kepler period (which provides dynamical limit rotation) as long core temperature is larger about 2 × 105 K. suggest have played role in evolution fastest spinning pulsars and it presently recently discovered 2.49 ms X-ray pulsar, SAX J1808.4-3658, well rapidly neutron stars observed low-mass binaries (LMXBs). This new explanation remarkably similar inferred from kilohertz, quasi-periodic oscillations LMXBs. The possibility gravitational-radiation-limited interesting, because gravitational waves star rotating detectable with generation interferometric detectors. (2) also consider white dwarfs find possibly short-period dwarfs. order-of-magnitude (for dwarf M=M☉ R=0.01 R☉ composed C12) show could operating rotational shorter P≈27-33 s. number interesting agreement (greater 28 s) DQ Herculis However, grows too slowly to affect these significantly.