Radiative force on molecules and its possible role for mass loss in evolved AGB stars

Details Radiative force on molecules and its possible role for mass loss in evolved AGB stars Radiative force on molecules and its possible role for mass loss in evolved AGB stars

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..168j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 168-176.

Physics

22

Carbon Stars, Molecular Absorption, Particle Acceleration, Stellar Atmospheres, Stellar Mass Ejection, Stellar Physics, Stellar Evolution, Stellar Models

Scientific paper

It has been shown in previous studies of M-type stars that absorption and scattering of photons by molecules in the outer atmospheres of oxygen-rich red giants and supergiants can provide a significant radiative force, typically amounting up to a few percent of the gravitational force in the stellar atmosphere. The present paper extends the previous considerations to carbon stars, and includes effects of the abundant polyatomic molecules HCN, C2H2, and C3. The radiative acceleration, arad, as a function of effective temperature, surface gravity, metallicity, and carbon-to-oxygen ratio. While it is shown that arad is only marginally dependent on the value of T(eff) and g, a significant increase is observed in arad when C/O increases from the solar value (0.43) toward unity, and an even stronger increase when C/O increases beyond unity. Molecular levitation increases strongly during a star's evolution on the AGB, and it is suggested that the increased levitation may contribute significantly to the onset of a super-wind which quickly terminates the nuclear burning life of the star.

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