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- W3100801715 abstract "Five regions of massive star formation have been observed in various molecular lines in the frequency range $sim 85-89$ GHz. The studied regions possess dense cores, which host young stellar objects. The physical parameters of the cores are estimated, including kinetic temperatures ($sim 20-40$ K), sizes of the emitting regions ($sim 0.1-0.6$ pc), and virial masses ($sim 40-500 M_{odot}$). Column densities and abundances of various molecules are calculated in the local thermodynamical equilibrium approximation. The core in 99.982+4.17, associated with the weakest IRAS source, is characterized by reduced molecular abundances. Molecular line widths decrease with increasing distance from the core centers ($b$). For $bga 0.1$~pc, the dependences $Delta V(b)$ are close to power laws ($propto b^{-p}$), where $p$ varies from $sim 0.2$ to $sim 0.5$, depending on the object. In four cores, the asymmetries of the optically thick HCN(1--0) and HCO$^+$(1--0) lines indicate systematic motions along the line of sight: collapse in two cores and expansion in two others. Approximate estimates of the accretion rates in the collapsing cores indicate that the forming stars have masses exceeding the solar mass." @default.
- W3100801715 created "2020-11-23" @default.
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- W3100801715 date "2016-09-29" @default.
- W3100801715 modified "2023-10-07" @default.
- W3100801715 title "Multifrequency studies of massive cores with complex spatial and kinematic structures" @default.
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- W3100801715 doi "https://doi.org/10.1134/s106377291610005x" @default.
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