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A NEW CRITERION FOR BAR-FORMING INSTABILITY IN RAPIDLY ROTATING GASEOUS AND STELLAR SYSTEMS. II. NONAXISYMMETRIC FORM

机译:快速旋转气态和星状系统中条形不稳定性的新判据。二。非对称形式

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摘要

We have previously introduced the parameter α as an indicator of stability to m = 2 nonaxisymmetric modes in rotating, self-gravitating, axisymmetric, gaseous (α approx< 0.34) and stellar (α approx< 0.25) systems. This parameter can be written as α = (ft/2)~(1/2), where t≡T/|W|, T is the total rotational kinetic energy, W is the total gravitational potential energy, and f is a function characteristic of the topology/connectedness and the geometric shape of a system. In this paper, we extend the stability criterion to nonaxisymmetric equilibrium systems by determining empirically the appropriate form of the function f for ellipsoids and elliptical disks and cylinders.
机译:我们先前已经引入参数α作为旋转,自重,轴对称,气态(α约<0.34)和恒星(α约<0.25)系统中m = 2个非轴对称模式的稳定性指标。该参数可表示为α=(ft / 2)〜(1/2),其中t≡T/ | W |,T为总旋转动能,W为总重力势能,f为函数系统的拓扑/连接特性和几何形状。在本文中,我们通过经验确定椭球,椭圆盘和圆柱体的函数f的适当形式,将稳定性判据扩展到非轴对称平衡系统。

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