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- W2269396369 abstract "We have observed 22 sources in ^13CO and C^18 O J = 1 - 0 lines with a 13.7-m telescope at Qinghai station of PMO, NAOC. The samples were chosen with new criteria so that the sources are much redder and fainter than those chosen before. All the 22 sources were detected with the pair lines of ^13CO and C^18 O and are suitable for analysing star formation except one multiple emission source IRAS 20300+3909. Physical parameters were derived from the local thermodynamic equilibrium assumption. The excitation temperature and column density of C^18 O are 13K and 1.5 × 10^15 cm^-2, respectively, on the average. 11 sources in the samples have line widths larger than 3 km/s. The IRAS colour indices are larger than those of class-O objects. The intermediate and farinfrared energy distributions show that the emission peaks of the samples fall in far infrared or longer wavelengths except IRAS 20149+3955, indicating that they may be very young stellar objects. Analyses of line widths and bolometric luminosity show that seven of those sources may be extremely young high or intermediate mass stellar objects." @default.
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- W2269396369 date "2003-01-01" @default.
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- W2269396369 title "A Search for Extremely Young Stellar Objects" @default.
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