Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182..313f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 2, Aug. 1987, p. 313-323.
Astronomy and Astrophysics
Astronomy
16
Hydrogen Clouds, Radio Sources (Astronomy), Early Stars, Gas Dynamics
Scientific paper
VLA observations at 2 and 6 cm with resolution of ≈6arcsec of the H II region S201 are presented. The radio source has a bright arc-shaped edge on one side and a smoothly decreasing surface brightness distribution on the opposite side. This configuration is interpreted in terms of a three dimensional electron distribution produced by the ionizing radiation of an early type star located outside a spherical molecular cloud. The classical model of a Strömgren sphere H II region is strongly altered by the gas outflow from the ionization front eroding the molecular cloud. Parameters of the model are optimized by matching a surface brightness model to the observed distribution. An O9 ZAMS star placed at a distance of 0.38 pc from a molecular cloud of 0.42 pc radius allows a good fit to the available data. The molecular cloud is eroded at a rate of 6.2×10-5M_sun;yr-1 and its gas outflow can produce the observed H II region on a time scale of 8×105yr.
Cesaroni Riccardo
Felli Marcello
Hjellming Robert M.
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