H2CO and CH3OH abundances in the envelopes around low-mass protostars
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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.
Originalsprog | Engelsk |
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Tidsskrift | Astronomy and Astrophysics |
Vol/bind | 437 |
Udgave nummer | 2 |
Sider (fra-til) | 501-515 |
Antal sider | 15 |
ISSN | 0004-6361 |
DOI | |
Status | Udgivet - 1 jul. 2005 |
Eksternt udgivet | Ja |
ID: 234015782