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Gerin, M.Gonzalez-Garcia, M. Melchior, M. Rollig, O.Berne, P. Dieleman, P.G. Martin, P. Pilleri, R. Gusten, R. Simon, R. Szczerba, S. Bruderer, S.D. Lord, S. Garcia-Burillo, T.G. Phillips, T. Klein, V. Ossenkopf, Y. Okada","submitted_at":"2010-07-09T07:55:12Z","abstract_excerpt":"Mon R2, at a distance of 830 pc, is the only ultracompact HII region (UC HII) where the photon-dominated region (PDR) between the ionized gas and the molecular cloud can be resolved with Herschel. HIFI observations of the abundant compounds 13CO, C18O, o-H2-18O, HCO+, CS, CH, and NH have been used to derive the physical and chemical conditions in the PDR, in particular the water abundance. The 13CO, C18O, o-H2-18O, HCO+ and CS observations are well described assuming that the emission is coming from a dense (n=5E6 cm-3, N(H2)>1E22 cm-2) layer of molecular gas around the UC HII. 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