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*A polytrope with index  has an <a href="page.php?w=Infinity">infinite</a> radius. It corresponds to the simplest plausible model of a self-consistent stellar system, first studied by <a href="page.php?w=Arthur_Schuster">Arthur Schuster</a> in 1883, and it has an <a href="page.php?w=Lane-Emden_equation">exact solution</a>.<br/>
*A polytrope with index  corresponds to what is called an isothermal sphere, that is an <a href="page.php?w=Isothermal_process">isothermal</a> <a href="page.php?w=Self-gravitation">self-gravitating</a> sphere of</p><p>
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