IRAS 01202+6133 : A Possible Case of Protostellar Collapse Triggered by
  a Small HII Region
  We present an analysis of HCO+ (J=3-2) and H13CO+ (J=3-2) observations of the
massive (M ~ 20 Msun) submm/IR source IRAS 01202+6133 located on the periphery
of the HII region KR 120 (Sh 2-187). The HCO+ line profile has a classic
blue-asymmetric shape with the optically thin H13CO+ line peaking at the
position expected if the HCO+ line arises from a combination of self-absorption
and infall motion. We have modified existing analytic radiative transfer models
to allow for the fitting of submm/mm line profiles that have both
self-absorption features and optically thin wings and applied these models to
our HCO+ spectrum of IRAS 01202+6133. We conclude that it is a young Class I
YSO with a substantial envelope undergoing slow infall and having some outflow
motions. The young age of the HII region rules out a "collect and collapse"
scenario. While we cannot eliminate the possibility that IRAS 01202+6133 formed
spontaneously at its current location, considering its early evolutionary state
and its proximity to the HII region we think that the formation of IRAS
01202+6133 was triggered by the expansion of KR 120 (Sh 2-187).
