Other
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204..452w&link_type=abstract
Astrophysical Journal, vol. 204, Mar. 1, 1976, pt. 1, p. 452-460.
Other
17
Gas Ionization, Interstellar Matter, Planetary Nebulae, Stellar Envelopes, Stellar Mass Ejection, Cold Gas, Gas Density, Globules, H Ii Regions, Shock Waves, Stellar Winds, Velocity Distribution
Scientific paper
The paper evaluates some temporal changes in interstellar temperature and ionization which are associated with multiple ejections of planetary nebulae. The dynamics of multiple ejections is analyzed in terms of isothermal shocks, ionization fronts, and expansion waves. The ionization of an initially cold nebula that had been ejected by a central star is examined in the case where the star ejects a second nebula. It is found that the first nebula may be broken up into dense swarm of globules surrounding the second nebula if it was not originally ionized by the star, but will resemble a H II region if it had been. The repeated ejection of planetary nebulae which merge with each other is investigated, and it is shown that the main characteristic of such repeated ejections is a thin shell of ionized gas with an electron density of the order of 100 per cu cm. It is concluded that a filamentary H II region will be produced if the radiation field reappears within a reasonable time period.
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