EDP Sciences
Free access
Volume 408, Number 1, September II 2003
Page(s) 331 - 335
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030917

A&A 408, 331-335 (2003)
DOI: 10.1051/0004-6361:20030917

Differential rotation and hydrodynamic stability of hot neutron stars

V. Urpin

A. F. Ioffe Institute for Physics and Technology, SU 194021, St. Petersburg, Russia Isaak Newton Institute of Chili, Branch in St. Petersburg, Russia
(Received 3 February 2003 / Accepted 22 May 2003)

Young neutron stars formed in core collapse or originating in the merger of a binary neutron star system may possess significant differential rotation. We consider the stability properties of such hot (non-superfluid) differentially rotating neutron stars. Compared to ordinary stars, the criteria of hydrodynamic instability of neutron stars can be different because generally the thermal diffusivity and viscosity are of the same order of magnitude and are relatively large. For example, the well-known Goldreich-Schubert instability can manifest itself only in rapidly rotating stars and is strongly suppressed if rotation is slow. The rotational instabilities in neutron stars can grow on the thermal or dynamical timescale.

Key words: MHD -- stars: neutron -- stars: rotation -- stars: pulsars: general

© ESO 2003