Top stars for alien life
http://news.bbc.co.uk/2/hi/science/nature/4728228.stm
From an interview with Margaret Turnbull at the Carnegie Institution in Washington DC, a survey to identify the most likely stars to have advanced life forms based on size, age and iron content has homed in on five stars as the best contenders. Variable stars, stars with short life spans and binary stars were excluded. Instead of searching all of space for evidence of technologically advanced life the idea is to look intensely at stars with maximum probability.
Andrew