Stellar compactness
= Stellar compactness
{title2=$C(r)=\frac{m(r)}r$}
The ratio of enclosed gravitational mass to areal radius in units $G=c=1$. In a spherical star the local value is $m(r)/r$, and the surface value is $M/R$. Bounds on this ratio constrain relativistic stellar models; it is unrelated to topological compactness.