The Region of Triggered Star Formation W40: Observations and Model
  A "collect and collapse" model of triggered star formation is used to
estimate the parameters of ring-like structure consisted of a sequence of
low-mass clumps in the W40 region. The model parameters are close to the
observed ones if the density of the cloud in which the HII zone is expanding is
fairly high (>~ 10^5 cm^{-3}) and the luminosity of the driving source exceeds
previous estimate. Probable reasons for the scatter of the observed parameters
of the clumps are discussed.
