The time evolution of a globule immersed in an H II region

Details The time evolution of a globule immersed in an H II region The time evolution of a globule immersed in an H II region

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....54..517t&link_type=abstract

Astronomy and Astrophysics, vol. 54, no. 2, Jan. 1977, p. 517-524.

Astronomy and Astrophysics

Astrophysics

16

Astrophysics, Globules, H Ii Regions, Ionization, Shock Wave Propagation, Gas Density, Isotropic Media, Reflected Waves, Time Response

Scientific paper

The motion of ionization fronts into globules in H II regions is studied numerically to show how the globules evolve, why they persist, and whether the overall flow pattern approaches the flow conditions described analytically by previous authors. The time evolution of the interaction between various weak R-type fronts and globules immersed in constant-density clouds is analyzed in three different cases. The results suggest that globules with a core of neutral gas can exist for long periods in H II regions, such a core should be surrounded by a region of ionized gas that may be observable as a bright-rim structure, and the normally assumed hydrostatic-equilibrium condition is violated by the appearance of shocks in the flow. It is also found that the ionized gas ultimately streams away from the condensations; that the ionizing flux is heavily attenuated in the ionized region, producing a very slow weak D-front; and that the surrounding ionization front should evolve very rapidly in the case of high-density condensations, leading to the immediate appearance of shocks in the flow and to a stationary weak D-front.

Affiliated with

Also associated with

No associations

Rating

The time evolution of a globule immersed in an H II region does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The time evolution of a globule immersed in an H II region, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The time evolution of a globule immersed in an H II region will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-951419