Low J/|W| dynamical instability in differentially rotating stars: Diagnosis with canonical angular momentum

Motoyuki Saijo*, Shinichirou Yoshida

*この研究の対応する著者

研究成果: Article査読

49 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1429-1442
ページ数14
ジャーナルMonthly Notices of the Royal Astronomical Society
368
3
DOI
出版ステータスPublished - 2006 5
外部発表はい

ASJC Scopus subject areas

  • 宇宙惑星科学

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