Chemical routes to dust formation in the ejecta of novae

Details Chemical routes to dust formation in the ejecta of novae Chemical routes to dust formation in the ejecta of novae

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..729r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Oct. 1, 1989, p. 729-740.

Astronomy and Astrophysics

Astronomy

30

Cosmic Dust, Ejecta, Interstellar Chemistry, Novae, Hydrocarbons, Nonequilibrium Conditions, Nucleation

Scientific paper

The feasibility of the chemical formation of dust-grain nucleation sites in the ejecta of novae is studied under the assumption that the region of ejecta out of which dust will condense is carbon neutral. The only satisfactory route to the formation of nucleation sites is shown to be via a limited hydrocarbon chemistry, making the depletion of oxygen into CO an essential prerequisite to the formation of hydrocarbon-based nucleation sites. The results of a time-dependent model of the hydrocarbon chemistry show that, for the formation of nucleation sites to occur, the ionization must be within certain limits and the H2 abundance must be high in the region of the ejecta where dust formation occurs. The results suggest that the ejecta configuration and ionization are important factors in determining whether or not a nova will produce dust.

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