Properties of the molecular clump and the associated ultracompact H II region in the gas shell of the expanding H II region Sh 2-104

Young Chol Minh, Kee Tae Kim, Chi Hung Yan, Yong Sun Park, Seokho Lee, Dharam Vil Lal, Tatsuhiko Hasegawa, X. Z. Zhang, Yi Jeng Kuan

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2 Citations (Scopus)


We study the physical and chemical properties of the molecular clump hosting a young stellar cluster, IRAS 20160+3636, which is believed to have formed via the "collect and collapse" process. Physical parameters of the UC H ii region associated with the embedded cluster are measured from the radio continuum observations. This source is found to be a typical Galactic UC H ii region, with a B0.5 type exciting star, if it is ionized by a single star. We derive a CN/HCN abundance ratio larger than 1 over this region, which may suggest that this clump is being affected by the UV radiation from the H ii region.

Original languageEnglish
Pages (from-to)179-185
Number of pages7
JournalJournal of the Korean Astronomical Society
Issue number5
Publication statusPublished - 2014 Oct 1



  • ISM: Abundances
  • ISM: HII regions
  • ISM: Molecules
  • Individual: Sh 2-104

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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