SSC/Stability/BiPolytropes/RedGiantToPN/Pt3

Main Sequence to Red Giant to Planetary Nebula (Part 3)

Part I:  Background & Objective

Part II:

Yabushita68-Motivated Analysis

Part IV:

Yabushita68-Motivated Analysis

In an accompanying discussion, we derived the so-called,

Polytropic LAWE

	$0=\frac{d^{2}x}{d{\xi }^2}+[4-(n+1)Q]\frac{1}{\xi }\cdot \frac{dx}{d\xi }+(n+1)\left[\right(\frac{{\sigma }_c^2}{6{\gamma }_g})\frac{{\xi }^2}{\theta }-\alpha Q]\frac{x}{{\xi }^2}$
where:    $Q(\xi )\equiv -\frac{d\ln \theta }{d\ln \xi },$    ${\sigma }_c^2\equiv \frac{3{\omega }^2}{2\pi G{\rho }_c},$     and,     $\alpha \equiv (3-\frac{4}{{\gamma }_{\mathrm{g}}})$

Motivated by the derivation presented by 📚 S. Yabushita (1968, MNRAS, Vol. 140, pp. 109 - 120), let's now insert an integration constant, $C_0$, into this 2^nd-order ODE to obtain what we henceforth will refer to as the,

Yabushita68-Motivated Polytropic LAWE

$C_0=\frac{d^{2}x}{d{\xi }^2}+[4-(n+1)Q]\frac{1}{\xi }\cdot \frac{dx}{d\xi }+(n+1)\left[\right(\frac{{\sigma }_c^2}{6{\gamma }_g})\frac{{\xi }^2}{\theta }-\alpha Q]\frac{x}{{\xi }^2}$

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