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We have investigated 32 HII regions and around 17 of them
we have found the clumped HI envelopes with radial motions.
The example of the envelope around HII regions M16 is shown on figure 1.
Expansion velocities of envelopes are from 8 up to 23 km/s
(it is more, than for the Supernova remnants).
The thickness of envelopes is rather great - 0.44 radius, mass are about
6E+4 mass of the Sun, kinetic energies - 10E+50 ergs.
The last two parameters do not differ from the envelopes around the
Supernova remnants, so the HII regions with their quantity and time of life
give the contribution of energy into interstellar matter not less than
remnants do.
The model of formation of HI envelope was advanced as outcome
of an operation of a summarized stellar wind of stars, exciting
HII region.
![]() Figure 1. Distribution of emission of a HI line around HII region M16. The line shows an extending envelope. ![]() Figure 2. Parameters of a spectrum of mass of exciting stars for 7 objects with measured IR-radiation. |