Minchin, Nigel R.; Ward-Thompson, Derek and White, Glenn J.
Carbon monoxide and far-infrared observations of the S 155-Cepheus B region.
Astronomy & Astrophysics, 265 pp. 733–742.
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We present maps of the CO J = 3-2 and 13CO J = 2→1 molecular line and mid- to far-infrared continuum emission of the interface between the Cepheus B molecular cloud and the S155 H II region. Far-infrared dust color temperature and optical depth maps show the molecular cloud to be externally heated and that the edge of the cloud is compressed by the expansion of S155. The data are compared with current models, and various dust grain parameters are derived. A hotspot is observed in the CO J = 3→2 emission line, at a position coincident with the radio continuum and infrared emission peaks. The infrared, radio continuum, and molecular line emission from the hotspot are all consistent with it being a compact H II region, ionized by an embedded B1-B0.5 star. The position of the compact H II region, adjacent to the northwestern edge of Cep B, suggests it is the product of a phase of sequential OB star formation, which has already been responsible for the youngest subgroup of the Cepheus OB3 association. The mass of the cloud is estimated to be ~100-200M⊙
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