Aperture synthesis observations of galactic H II regions. IV - New observations of H II regions around L = 111 deg

Details Aperture synthesis observations of galactic H II regions. IV - New observations of H II regions around L = 111 deg Aperture synthesis observations of galactic H II regions. IV - New observations of H II regions around L = 111 deg

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59...27i&link_type=abstract

Astronomy and Astrophysics, vol. 59, no. 1, July 1977, p. 27-41.

Astronomy and Astrophysics

Astronomy

70

H Ii Regions, Hydrogen Ions, Nebulae, Stellar Evolution, Astronomical Maps, Centimeter Waves, Radio Astronomy, Relief Maps, Tables (Data)

Scientific paper

New observations at 6 cm and reexamination of old 21-cm observations confirm and extend the conclusions drawn earlier from previous aperture-synthesis data. In the Cas-Cep section of the Perseus Arm a loose OB association appears to be forming; formation of stars occurs in subgroups at the outer edge of neutral clouds. The area is the site of active star formation, with high-density compact H II components in S 156, S 157, S 158, and S 159. Available information on S 156 and S 158 is consistent with a model originally applied to the Orion nebula, in which an early-type star ionizes a neutral cloud from outside; ionized gas streams away from the resulting ionization front. Both S 156 and S 158 are viewed almost edge-on. A comparison of optical and radio observations shows clumping factors of 2 to 10 for S 156, 10 to 90 for S 158 and around 2 for S 162.

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