SIMBAD references

2012MNRAS.422.1098R - Mon. Not. R. Astron. Soc., 422, 1098-1108 (2012/May-2)

The molecular emissions and the infall motion in the high-mass young stellar object G8.68-0.37.

REN Z., WU Y., ZHU M., LIU T., PENG R., QIN S. and LI L.

Abstract (from CDS):

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 Td= 20 and 120 K, respectively. The core has a total mass of up to 1.5 {x} 103 M and a bolometric luminosity of 2.3 {x} 104 L. Both the mass and luminosity are dominated by the cold component (Td= 20 K). The molecular lines of C18O, C34S, DCN and thermally excited CH3OH are detected in this core. Prominent infall signatures are observed in the 12CO (1 - 0) and (2 - 1). We estimated an infall velocity of 0.45 km/s and a mass infall rate of 7 {x} 10–4 M/yr. 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.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): stars: formation - stars: pre-main sequence - ISM: individual object: G8.68-0.37 - ISM: kinematics and dynamics - ISM: molecules

Simbad objects: 7

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