The University of Southampton
University of Southampton Institutional Repository

Low T/|W| dynamical instability in differentially rotating stars: diagnosis with canonical angular momentum

Low T/|W| dynamical instability in differentially rotating stars: diagnosis with canonical angular momentum
Low T/|W| dynamical instability in differentially rotating stars: diagnosis with canonical angular momentum
We study the nature of non-axisymmetric dynamical instabilities in differentially rotating stars with both linear eigenmode analysis and hydrodynamic simulations in Newtonian gravity. We especially investigate the following three types of instability; the one-armed spiral instability, the low T/|W| bar instability, and the high T/|W| bar instability, where T is the rotational kinetic energy and W is the gravitational potential energy. The nature of the dynamical instabilities is clarified by using a canonical angular momentum as a diagnostic. We find that the one-armed spiral and the low T/|W| bar instabilities occur around the corotation radius, and they grow through the inflow of canonical angular momentum around the corotation radius. The result is a clear contrast to that of a classical dynamical bar instability in high T/|W|. We also discuss the feature of gravitational waves generated from these three types of instability.
0035-8711
1429-1442
Saijo, Motoyuki
f2128aae-e896-4290-a382-d413c868a617
Yoshida, Shin'ichirou
f88009cd-469c-4bf1-b3de-3161ec5a4758
Saijo, Motoyuki
f2128aae-e896-4290-a382-d413c868a617
Yoshida, Shin'ichirou
f88009cd-469c-4bf1-b3de-3161ec5a4758

Saijo, Motoyuki and Yoshida, Shin'ichirou (2006) Low T/|W| dynamical instability in differentially rotating stars: diagnosis with canonical angular momentum. Monthly Notices of the Royal Astronomical Society, 368 (3), 1429-1442. (doi:10.1111/j.1365-2966.2006.10229.x).

Record type: Article

Abstract

We study the nature of non-axisymmetric dynamical instabilities in differentially rotating stars with both linear eigenmode analysis and hydrodynamic simulations in Newtonian gravity. We especially investigate the following three types of instability; the one-armed spiral instability, the low T/|W| bar instability, and the high T/|W| bar instability, where T is the rotational kinetic energy and W is the gravitational potential energy. The nature of the dynamical instabilities is clarified by using a canonical angular momentum as a diagnostic. We find that the one-armed spiral and the low T/|W| bar instabilities occur around the corotation radius, and they grow through the inflow of canonical angular momentum around the corotation radius. The result is a clear contrast to that of a classical dynamical bar instability in high T/|W|. We also discuss the feature of gravitational waves generated from these three types of instability.

This record has no associated files available for download.

More information

Published date: May 2006

Identifiers

Local EPrints ID: 40703
URI: http://eprints.soton.ac.uk/id/eprint/40703
ISSN: 0035-8711
PURE UUID: 5be165ea-dc6d-4d68-bd79-e4b0319ddc21

Catalogue record

Date deposited: 07 Jul 2006
Last modified: 08 Jan 2022 12:59

Export record

Altmetrics

Contributors

Author: Motoyuki Saijo
Author: Shin'ichirou Yoshida

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×