THEORETICAL INVESTIGATIONS OF THE EXPANSION OF H II REGIONS.
Final rept. for 1 Oct 63-31 Dec 64,
CHICAGO UNIV ILL
Pagination or Media Count:
The essential phenomenon is the ionization of hydrogen in the interstellar gas by the radiation emitted in the Lyman continuum by a newly formed star of early spectral type. As the gas is ionized it is heated as well. The volume of ionized gas the H II region tends to expand, generating a compression wave moving out through the surrounding neutral interstellar gas the H I region. The general objective of research in this area has been the construction of theoretical models of the manner in which the gas becomes ionized in an H II region and of the gas-dynamical response of both the neutral gas and the ionized gas to the ionization and heating of the gas.