Star Formation on the Edge: A Young Stellar Cluster forming in a Photoevaporating Molecular Cloud Core

Previous abstract Next abstract

Session 122 -- Ultracompact HII Regions and Star Formation
Oral presentation, Thursday, 12, 1995, 2:00pm - 3:30pm

[122.01] Star Formation on the Edge: A Young Stellar Cluster forming in a Photoevaporating Molecular Cloud Core

S. T. Megeath (Max-Planck-Institut f\"ur Radioastronomie), T. L. Wilson (Max-Planck-Institut f\"ur Radioastronomie), T. M. Herbst (Max-Planck-Institut f\"ur Astronomie)

We present multi-wavelength observations of a young cluster forming in a dense core on the edge of the NGC 281 West molecular cloud. Near--infrared imaging of the young cluster reveals that the it is broken into several stellar groups. A C$^{18}$O (2-1) map from the IRAM 30 meter resolves the molecular core into at least three separate clumps, all of which are displaced to the south of a stellar group. VLA 20 centimeter observations show ionized gas to the north of the molecular clumps. Since the O5 star BD 5005 is situated to the north of the cloud, we propose that VLA data is tracing the gas photoevaporated from the cloud cores by BD 5005. This scenario is supported by the C$^{18}$O (2-1) line profiles which show evidence of a radiatively driven shock on the northern edge of two of the clumps. At the interface of the molecular and ionized gas we find groups of stars, most of which are found in the ionized gas. We discuss the possibility of induced star formation by shocks and the role of photoevaporation in terminating accretion in the stellar cluster.

Thursday program listing