CS observations of the hotspot at the S 155/Cepheus B interface

Details CS observations of the hotspot at the S 155/Cepheus B interface CS observations of the hotspot at the S 155/Cepheus B interface

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...339..872o&link_type=abstract

Astronomy and Astrophysics, v.339, p.872-879 (1998)

Astronomy and Astrophysics

Astrophysics

1

Hii Regions, Ism: Molecules, Stars: Formation, Radio Lines: Ism

Scientific paper

We have used the IRAM 30-m telescope to map, in the J=2-1, J=3-2 and J=5-4 rotational transitions of CS, the molecular hotspot located south-east of the Cepheus OB3 association, at the interface that divides the S 155 diffuse Hii region from the Cepheus B molecular cloud. We have also used the FCRAO 13.7-m telescope to map the larger scale CS(2-1) emission. The $+/-imeq 1'\times 1'$ segment that has been mapped at higher spatial resolution with the 30-m telescope covers four radio continuum sources, one of which (source A) is a blister-type Hii region. By using the CS molecule we analyse: i) the molecular density at the interface region and ii) the kinematics of the molecular gas at the front. The observations confirm that the blister has created a cavity at the edge of the molecular hotspot and is bounded on its sharp side by a dense mlecular front in pressure equilibrium with the ionized gas. The near-IR star at the centre of the blister (A-NIR) is responsible for its ionization and for the heating of the hotspot.

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