High density molecular clumps around protostellar candidates
نویسندگان
چکیده
منابع مشابه
A molecular - line study of clumps with embedded high - mass protostar candidates
We present molecular line observations made with the IRAM 30-m telescope of the immediate surroundings of a sample of 11 candidate high-mass protostars. These observations are part of an effort to clarify the evolutionary status of a set of objects which we consider to be precursors of UC Hii regions. In a preceding series of papers we have studied a sample of objects, which on the basis of the...
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We have used the IRAM 30-m and FCRAO 14-m telescopes to observe the molecular clumps associated with 12 ultracompact (UC) Hii regions in the J=6–5, 8–7 and 13–12 rotational transitions of methyl-acetylene (CH3C2H). Under the assumption of LTE and optically thin emission, we have derived temperature estimates ranging from 30 to 56 K. We estimate that the clumps have diameters of 0.2–1.6 pc, H2 d...
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics Supplement Series
سال: 1999
ISSN: 0365-0138,1286-4846
DOI: 10.1051/aas:1999218