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We present an analysis of HCO+ (J=3-2) and H13CO+ (J=3-2) observations of themassive (M ~ 20 Msun) submm/IR source IRAS 01202+6133 located on the peripheryof the HII region KR 120 (Sh 2-187). The HCO+ line profile has a classicblue-asymmetric shape with the optically thin H13CO+ line peaking at theposition expected if the HCO+ line arises from a combination of self-absorptionand infall motion. We have modified existing analytic radiative transfer modelsto allow for the fitting of submm/mm line profiles that have bothself-absorption features and optically thin wings and applied these models toour HCO+ spectrum of IRAS 01202+6133. We conclude that it is a young Class IYSO with a substantial envelope undergoing slow infall and having some outflowmotions. The young age of the HII region rules out a "collect and collapse"scenario. While we cannot eliminate the possibility that IRAS 01202+6133 formedspontaneously at its current location, considering its early evolutionary stateand its proximity to the HII region we think that the formation of IRAS01202+6133 was triggered by the expansion of KR 120 (Sh 2-187).

IRAS 01202+6133 : A Possible Case of Protostellar Collapse Triggered by a Small HII Region