Thermal-chemical instabilities in CO clouds

Details Thermal-chemical instabilities in CO clouds Thermal-chemical instabilities in CO clouds

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204..403g&link_type=abstract

Astrophysical Journal, vol. 204, Mar. 1, 1976, pt. 1, p. 403-407.

Astronomy and Astrophysics

Astrophysics

28

Carbon Monoxide, Cosmic Gases, Interstellar Matter, Protostars, Thermochemical Properties, Astrophysics, Charge Exchange, Molecular Gases, Nonequilibrium Conditions, Radiative Recombination

Scientific paper

The stability of interstellar clouds containing CO is analyzed taking account of formation processes for CO. Two such processes are examined: O(+) charge exchange and C(+) radiative association. It is found that the C(+) radiative-association chemistry leads to low-temperature instabilities which influence the evolution of clouds. It is also found that instability may set in if CO production increases sufficiently with density, that the O(+) charge-exchange chemistry leads to instability associated with attenuation of the interstellar radiation field by grains, and that thermal instabilities will also result if grain formation, rather than ion-molecule chemistry, dominates CO production. It is suggested that such instabilities play a role in the fragmentation of interstellar clouds and in the formation of protostellar objects.

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