Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6574h&link_type=abstract
HST Proposal ID #6574
Physics
Hst Proposal Id #6574 Interstellar Medium
Scientific paper
Photoionization of photoevaporative flows provides a paradigm that ties the density, ionization, and dynamical structure of H II regions together in a single physical description {Hester et al. 1991a; Hester 1991}. Such a model in principal removes much of the ambiguity in modeling of H II regions by providing a single prescription for calculating both the density and ionization structure of the region of emission. Recently Hester et al. {1995} successfully applied this model to WFPC2 observations of the H II region / molecular cloud interface in M16. In addition, we discovered over 50 small star forming globules being uncovered as the molecular material around them was evaporated. These objects call into question the ``evaporating disk'' interpretation of similar objects in M42. They also provide evidence of the role of photoevaporation in establishing the IMF in regions surrounding massive stars. In this proposal we request WFPC2 images of M17 to allow us to continue this work. These data will allow us to test the photoevaporative flow picture in a very different environment than M16, as well as continue the investigation of the interplay between massive stars and star formation in surrounding regions.
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