The gas dynamics around OB associations. I - Recombining H II regions and the formation of expanding neutral shells

Details The gas dynamics around OB associations. I - Recombining H II regions and the formation of expanding neutral shells The gas dynamics around OB associations. I - Recombining H II regions and the formation of expanding neutral shells

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112....1b&link_type=abstract

Astronomy and Astrophysics, vol. 112, no. 1, Aug. 1982, p. 1-10.

Astronomy and Astrophysics

Astrophysics

41

B Stars, Gas Dynamics, H Ii Regions, O Stars, Star Clusters, Stellar Evolution, Ionized Gases, Ionizing Radiation, Neutral Gases, Recombination Reactions, Shock Fronts, Stellar Envelopes, Stellar Radiation

Scientific paper

The time evolution of an H II region excited by a variable ionizing source is followed. The constant density neutral medium is initially assumed to be at rest, and spherical symmetry is assumed. Two types of variable central sources are chosen, and several cases for each type are presented. The early evolution (at constant photon flux) is found to proceed in the well-known 'classical' manner. An ionization front (I front) propagates out to the Stromgren radius supersonically. The I front at that point becomes D-type; it is preceded by a shock front, and a rarefaction wave propagates inward. When the ionizing flux begins to decrease, the subsequent evolution (recombination phase) is dependent on the details of the variable source. In all cases calculated, it is found that the H II region first becomes smaller and then begins to reexpand; a second shock front is then formed.

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