Polycyclic aromatic hydrocarbon optical properties and contribution to the acceleration of stellar outflows

Details Polycyclic aromatic hydrocarbon optical properties and contribution to the acceleration of stellar outflows Polycyclic aromatic hydrocarbon optical properties and contribution to the acceleration of stellar outflows

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..541c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 541-552. Research supported by NSF and DOE.

Astronomy and Astrophysics

Astrophysics

28

Aromatic Compounds, Cyclic Hydrocarbons, Interstellar Gas, Molecular Gases, Optical Properties, Stellar Envelopes, Absorption Spectra, Line Spectra, Radiation Pressure, Spectrum Analysis

Scientific paper

The optical constants of four polycyclic aromatic hydrocarbon (PAH) molecules (benzene, pyrene, pentacene, and coronene) are determined from their measured laboratory absorption spectra. The Planck mean of the radiation pressure cross section is computed for each molecule and for amorphous carbon (AC) grains, and semiempirically estimated for large PAH molecules up to 400 carbon atoms. Assuming that PAHs are present in carbon-rich stellar outflows, the radiation pressure forces acting on them are calculated and compared with the radiation forces on AC particles. The results show that PAHs possess very different optical properties from AC grains. Small PAHs may experience an 'inverse greenhouse' effect in the inner part of the envelope, as they decouple from the gas close to the photosphere. The radiation pressure force on PAHs is always much less than the force at work on AC grains, and PAH molecules do not affect significantly the dynamics of the outflow.

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