Molecular self-shielding in the outflows from late-type stars

Details Molecular self-shielding in the outflows from late-type stars Molecular self-shielding in the outflows from late-type stars

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..546m&link_type=abstract

Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 546-553. NASA-supported research.

Astronomy and Astrophysics

Astronomy

83

Late Stars, Molecular Interactions, Radio Sources (Astronomy), Stellar Envelopes, Stellar Mass Ejection, Carbon Monoxide, Centimeter Waves, Hydrogen, Photodissociation, Stellar Winds

Scientific paper

It is proposed that molecules, especially CO and H2, in the circumstellar outflows from late-type stars can be self-shielded from ambient interstellar UV radiation. The theory of self-shielding in spherical, expanding envelopes is developed for the case in which the photodestruction is dominated by absorption in the Doppler cores of the relevant UV lines, and it is shown that this theory can account for the observations of IRC plus 10216. Also considered is the case in which photodestruction takes place in the damping wings of the UV lines as is appropriate for H2. It is found that most of the hydrogen remains molecular, although the amount of atomic hydrogen is not completely negligible.

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