Are these objects's references on the Stack or on the Heap?

I would really appreciate if someone could tell me whether I understand it well:

class X
{
   A a1=new A(); // reference on the stack, object value on the heap
   a1.VarA=5;    // on the stack - value type
   A a2=a1;      // reference on the stack, object value on the heap
   a2.VarA=10;   // on the stack - value type         
}

Also both a1 and a2 references are on the stack, while their "object" values are on the heap. But what about VarA variable, its still pure value type?

class A
{
   int VarA;
}