Forskning ved Københavns Universitet - Københavns Universitet


H2CO and CH3OH abundances in the envelopes around low-mass protostars

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Single dish studies of molecular abundances in the envelopes around a large sample of 18 low-mass pre and protostellar objects were presented. Typical grain mantle products and organic molecules, including H2CO, CH 3OH, and CH3CN were studied. It was found that with a few exceptions, all H2CO lines can be fit by constant abundances of 7x10-11-8x10-9 throughout the envelopes if ortho and para lines are considered independently. An improved fit to the data was obtained with a 'drop' abundance structure in which the abundance is typically few x 10-10 when the temperature is lower than the evaporation temperature.

TidsskriftAstronomy and Astrophysics
Udgave nummer2
Sider (fra-til)501-515
Antal sider15
StatusUdgivet - 1 jul. 2005

ID: 234015782