Novae from isolated white dwarfs as a source of helium for second
  generation stars in globular clusters
  We explore the possible contribution of classical and recurrent novae from
isolated white dwarfs accreting from the intracluster medium to the abundances
of "second generation" globular cluster stellar populations. We show that under
reasonable assumptions the helium abundances of clusters can be enhanced
substantially by these novae and argue that novae should be considered as an
important, and perhaps even dominant channel in the evolution of the
intracluster medium. We also discuss a possible test for whether helium
enhancement really is the cause of the multiple main sequences in globular
clusters that is independent of the positions of stars in the color-magnitude
diagram.
