A scenario for the selective depletion of stellar atmospheres

Details A scenario for the selective depletion of stellar atmospheres A scenario for the selective depletion of stellar atmospheres

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262l..37w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. L37-L40.

Astronomy and Astrophysics

Astrophysics

126

Atmospheric Composition, Stellar Atmospheres, Stellar Evolution, Stellar Mass Accretion, Cosmic Dust, Interstellar Gas, Stellar Envelopes

Scientific paper

We propose that a low mass-accretion rate of gas and dust from a circumstellar or circumsystem disk onto AF-type stars in very different evolutionary phases can lead to the selective accretion of only the gas due to the differential forces that act on the gas and the dust. This may result in a photosphere with a depletion pattern similar to that of the interstellar medium. Such a mechanism can explain the abundance patterns in Lambda Boo stars and in some post-AGB stars that are in wide binary systems. Accretion of clean gas from a circumsystem disk in post-AGB binaries requires much less strict conditions on the binary evolution than the binary scenario proposed by Mathis & Lamers (1992) does.

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