Scientific collaborations in astronomy between amateurs and   professionals
  As our successful Mons campaign to observe WR140 has shown, there is a strong interest among both amateur and professional astronomers to collaborate on specific scientific questions. I highlight here some recent examples of successful collaborations, and outline a number of areas of astronomy where Pro-Am collaborations are making a difference. 
Johan H. Knapen
astro-ph.IM astro-ph.SR