Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117..297b&link_type=abstract
Astronomy and Astrophysics, vol. 117, no. 2, Jan. 1983, p. 297-304.
Astronomy and Astrophysics
Astrophysics
20
B Stars, Neutral Gases, O Stars, Star Distribution, Supernova Remnants, Brightness Temperature, Centimeter Waves, Galactic Evolution, Gas Dynamics, H Ii Regions, Milky Way Galaxy, Stellar Envelopes, Stellar Evolution, Stellar Mass Ejection
Scientific paper
The present investigation of neutral hydrogen distribution and kinematics around the H II regions W 3, W 4, and W 5, as well as the SNR HB3 (which belongs to the Cas OB6 association), has discovered the development of an expanding neutral shell around W 4 which suggests that W 4 is the oldest H II region in the association. The neutral shell expansion is of the blister type, and on a scale of 50-100 pc, due to its location at the edge of a large neutral and molecular cloud complex. The shell has reached W 3 in the west, and may have initiated star formation, while tunnels direct away from the W 4 cavity towards W 5 in the east, where an expanding shell has begun to form.
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