  The estimates of the delivery of icy planetesimals from the feeding zone of
Proxima Centauri c (with mass equal to 7mE, mE is the mass of the Earth) to
inner planets b and d were made. They included the studies of the total mass of
planetesimals in the feeding zone of planet c and the probabilities of
collisions of such planetesimals with inner planets. This total mass could be
about 10-15mE. It was estimated based on studies of the ratio of the mass of
planetesimals ejected into hyperbolic orbits to the mass of planetesimals
collided with forming planet c. At integration of the motion of planetesimals,
the gravitational influence of planets c and b and the star was taken into
account. In most series of calculations, planetesimals collided with planets
were excluded from integrations. Based on estimates of the mass of
planetesimals ejected into hyperbolic orbits, it was concluded that during the
growth of the mass of planet c the semi-major axis of its orbit could decrease
by at least a factor of 1.5. Depending on possible gravitational scattering due
to mutual encounters of planetesimals, the total mass of material delivered by
planetesimals from the feeding zone of planet c to planet b was estimated to be
between 0.002mE and 0.015mE. Probably, the amount of water delivered to Proxima
Centauri b exceeded the mass of water in Earth's oceans. The amount of material
delivered to planet d could be a little less than that delivered to planet b.
