The evolution of massive bipolar jets and the birth of H II regions

Details The evolution of massive bipolar jets and the birth of H II regions The evolution of massive bipolar jets and the birth of H II regions

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986cajph..64..383b&link_type=abstract

(Conference on Jets from Stars and Galaxies, Toronto, Canada, June 24-27, 1985) Canadian Journal of Physics (ISSN 0008-4204), vo

Physics

3

H Ii Regions, Molecular Clouds, Pre-Main Sequence Stars, Stellar Evolution, Carbon Monoxide, Ionizing Radiation, Molecular Spectra, Ultraviolet Radiation

Scientific paper

Observations suggest that outflows of neutral gas are among the first visible signs of the birth of a new star. Stars destined to be of spectral type O or B on the main sequence eventually emit large quantities of ionizing ultraviolet radiation that produce H II regions. The powerful neutral wind associated with the bipolar outflow phase of pre-main-sequence stellar evolution produces cavities in the gas surrounding a newborn star and regulates the escape of ionizing radiation from the vicinity of the star. The birth and early evolution of H II regions is the final phase in the development of bipolar, molecular outflows surrounding massive stars.

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