H2CO and CH3OH abundances in the envelopes around low-mass protostars
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H2CO and CH3OH abundances in the envelopes around low-mass protostars. / Jørgensen, J. K.; Schöier, F. L.; Van Dishoeck, E. F.
I: Astronomy and Astrophysics, Bind 437, Nr. 2, 01.07.2005, s. 501-515.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - H2CO and CH3OH abundances in the envelopes around low-mass protostars
AU - Jørgensen, J. K.
AU - Schöier, F. L.
AU - Van Dishoeck, E. F.
PY - 2005/7/1
Y1 - 2005/7/1
N2 - 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.
AB - 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.
KW - Astrochemistry
KW - ISM: abundances
KW - ISM: molecules
KW - Radiative transfer
KW - Stars: formation
UR - http://www.scopus.com/inward/record.url?scp=21644480725&partnerID=8YFLogxK
U2 - 10.1051/0004-6361:20042060
DO - 10.1051/0004-6361:20042060
M3 - Journal article
AN - SCOPUS:21644480725
VL - 437
SP - 501
EP - 515
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
IS - 2
ER -
ID: 234015782