we know that every maximal ideal in $C(X)$ is in this form:

$$M^p=\left\{\,f \in C^*(x):\  p\in cl_{\beta X} Z\left(f\right)\,\right\}$$

and every maximal ideal in $C^*(X)$ is 

$$M^{*p}=\left\{\,f\in C^*(X):\  f^{\beta}\left(p\right)=0\,\right\}$$

and it is not necessary that 
 
$$ M^p \cap C^*(X) = M^{*p}$$

My question is:

If are prime ideals of $C(X)$ contained in $M^p$, in a one to one corresponding to that of $C^*(X)$ contained in $M^{*p}$ for $p\in \beta X$ ?
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$M^p$ and $M^{*p}$ are maximal ideals respectively in $C(X)$ and $C^*(X)$ correspond to $p$.
$\beta X$ is Ston-cech compactification of the space $X$
for terminalogy and notions you can refer to [here][1].
 


  [1]:https://books.google.com/books?hl=en&lr=&id=3j3SBwAAQBAJ&oi=fnd&pg=PA1&dq=Rings+of+continuous+functions&ots=0UmBXt62ta&sig=yhl_h8zAq9FKOJBIxZ1-1UgEyTc#