Subject: Habitable zones of stars

I was wondering if every star had a habitable zone in which planets could 
have liquid water.  I know sun-like stars are the most likely canditates 
for these type of planets, but what about other types?  Would it be 
possible for a white dwarf to have a habitable zone near it?  What about 
brown dwarves or red giants?  Also if the zone was extremly close to the 
star, what are the chances of a planet forming?  What method is used to 
determine the habitable zone for stars in the first place?  Thanks in 
advance

Re: Habitable zones of stars