Changes between Version 18 and Version 19 of u/erica/radtimescales

Timestamp:

03/30/16 15:42:24 (9 years ago)

Author:

Erica Kaminski

Comment:

—

u/erica/radtimescales

@@ -99 +99 @@
 How long it takes the gas to respond to changes in the internal energy depends on the crossing time over some appropriate length scale.
 
+''' Freefall time '''
+
+Material in the core will fall onto the star if it is Jeans unstable (or it can fragment). An estimate for the time it will take to 'collapse' onto the star is given by the freefall time:
+
+[[latex($t_{ff}\approx\frac{1}{2}\frac{1}{\sqrt{G\rho}}$)]]
+
+where rho is the mean density of the gas.
+
+To check if the gas is Jeans unstable,