2 the equa8on of mo8on is d 2 eff dr r 2 dt

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Unformatted text preview: nd design: symmetric, coherent structure –  Flocculent spirals: short spiral arms, asymmetric •  Two theories: (1) ______- wave; (2) stochas8c self- propaga8ng star forma8on 4/18/2013 UW, ASTR 323, SP13, Eric Agol ©2013 7 Radial oscilla8ons •  Stars orbi8ng in a disk oscillate in the ver8cal (HW 1) & radial direc8on •  If disk is axisymmetric, then in the radial direc8on, ______ momentum is conserved so dφ JZ = R dt !! 2 •  The _____ equa8on of mo8on is # dφ &2 ∂Φ ∂Φeff dR = R% ( − 2 €dt ' ∂R = − ∂R $ !!dt 2 4/18/2013 Φeff = !! UW, ASTR 323, SP13, Eric Agol...
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