期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 422, 期 2, 页码 1098-1108出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2012.20683.x
关键词
stars: formation; stars: pre-main sequence; ISM: individual object: G8.68-0.37; ISM: kinematics and dynamics; ISM: molecules
资金
- NSFC [10733033, 10873019, 10973003]
- NKBRP [2009CB24901, 2012CB821800]
- Doctoral Candidate lnnovation Research Support Program from Science & Technology Review [Kjdb 201001-1]
We present a multi-wavelength observational study towards the high-mass young stellar object G8.68-0.37. A single massive gas-and-dust core is observed in the (sub) millimetre continuum and molecular line emissions. We fitted the spectral energy distribution (SED) from the dust continuum emission. The best-fitting SED suggests the presence of two components with temperature of T-d = 20 and 120 K, respectively. The core has a total mass of up to 1.5 x 10(3) M-circle dot and a bolometric luminosity of 2.3 x 10(4) L-circle dot. Both the mass and luminosity are dominated by the cold component (Td = 20 K). The molecular lines of (CO)-O-18, (CS)-S-34, DCN and thermally excited CH3OH are detected in this core. Prominent infall signatures are observed in the (CO)-C-12 (1 - 0) and (2 - 1). We estimated an infall velocity of 0.45 km s(-1) and a mass infall rate of 7 x 10(-4) M-circle dot yr(-1). From the molecular lines, we have found a high DCN-to-HCN abundance ratio of 0.07. The overabundant DCN may originate from a significant deuteration in the previous cold pre-protostellar phase. And the DCN should now be rapidly sublimated from the grain mantles to maintain the overabundance in the gas phase.
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