Gas-Phase Chemistry of the Star Forming Region W3 IRS4 |
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| Authors: | Magdy Y Amin |
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| Institution: | (1) Astronomy Dept., Faculty of Science, King Saud University, Riyadh, 11451, Saudi Arabia |
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| Abstract: | We have followed the chemistry of W3 IRS4, as one of the most famous regions with a chemistry similar to that found in quiescent
molecular clouds. Here the time scale, since star formation, has probably been long enough for the gas-phase ion-molecule
chemistry to become dominant again. We have constructed a reaction system containing the chemical families of H, C, O, N,
S and metals (Me:Fe, Mg, Na and Si). A total of 282 species have been included and a network of 1270 reactions has been used.
The chemical kinetic equations were integrated as a function of pseudo-time-dependent approach. The evolution of the different
chemical species are followed in models of density n equal to 106 cm-3 and temperature T equal to 55 K. Different initial abundances have been assumed. Our results are in reasonable agreement
with the observation, especially in Model 6. The resulting molecular abundances are compared with those obtained in the intermediate
mass star NGC 2264 IRS1, as well as the low mass IRAS 16293-2422.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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