Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450..179d&link_type=abstract
Astrophysical Journal v.450, p.179
Astronomy and Astrophysics
Astronomy
4
Ism: Clouds, Ism: Dust, Extinction, Molecular Processes
Scientific paper
Observational data on the abundance of H2O ice, CO frost, and a carbonaceous condensate in the Taurus cloud are used to estimate sticking efficiencies S*X; for O and C on dust in this cloud, where S*X is the efficiency factor leading to molecule formation and retention on dust S*O is found to be very small [˜2 × (10-3 -10-4)] when conditions are such that a monolayer of ice has not formed on dust. When a monolayer is present S*O ˜6 × (10-2 -10-3), where the range of S*O corresponds to cloud lifetimes of 0.3-3 Myr respectively. The threshold extinction AOV for ice accretion is suggested to be related to the formation of this monolayer. A comparison with conditions in the ξ Oph cloud B shows no more than a few monolayers of ice have formed on dust in this object.
S*C also shows a reduction at AV ˜ AOV, suggesting that the presence of a monolayer of ice also influences the accretion of carbonaceous material. The overall sticking efficiency for CO molecules on the dust in Taurus is SCO ˜ 3.7 × (10-2 -10-3). These low values likely reflect the role of H2 formation and cosmic rays on desorption of accreted molecules.
Duley Walter W.
Smith Gary R.
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