Time dependent chemical study of contracting interstellar clouds. I. Abundances of nitrogen- and carbon-bearing molecules

Amin, Mohamed; Nawawy, M. S. El; Ateya, B. G.; Aiad, A.

doi:10.1007/bf00613093

Earth Moon Planet

1995

DOI: 10.1007/bf00613093

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Time dependent chemical study of contracting interstellar clouds. I. Abundances of nitrogen- and carbon-bearing molecules

Mohamed Amin

M. S. El Nawawy²,

B. G. Ateya

et al.

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1996

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Cited by 2 publications

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The chemical evolution in a model of contracting cloud

Amin

El-Nawawy

1996

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The evolution of the different chemical species are followed in a model of contracting interstellar cloud. The central density increases from n = 10 cme3 diffuse initial cloud model to a dense cloud with central density number of n 1 lo5 cmA3 after a time of 1.2 x lo7 yr. A network of 622 reactions has been involved. The chemistry of the cloud is integrated simultaneously with the hydrodynamic equations of contraction.The results predict that the different molecular species increase in abundance as the contraction proceeds. The species which enhance significantly are CO, HCO, CS and NO. The fractional abundances of many of the other molecular species increase distinctly with contraction, e.g. CH, GH, CN, SOz, COz, HzO, CZ, NHs, HCN, SO, OCS and SN. The transformation of the initial diffuse cloud model with small abundances of molecular species to a dense molecular cloud with enhancement of the different molecular species is confirmed. The results predict good agreements of our results with both the observations and other theoretical studies.

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The chemical evolution in a model of contracting cloud

Amin

El-Nawawy

1996

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The evolution of charged particles in a model of contracting cloud

El-Nawawy

Amin

1996

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The evolution of the charged particles are followed during contraction of a model of an interstellar cloud, with initial density number of n = 10 cmV3. The contraction is followed up to density increase by five orders of magnitude. Special care is given to the details of the negative ions.In addition, we have tested the ambipolar diffusion according to the results of the ion density.The results predict the importance of atomic ions in the diffuse regions. H+ and C+ are distinctly enhanced in the beginning of contraction but decrease as contraction proceeds. Molecular ions enhance as contraction P roceeds and becomes important in dense regions. The most enhanced molecular ions are HCO+, 0, , CaH$, H30+ and SO+. Hz is less abundant. The atomic ions (except metalic ions) decrease noticeably as density increases. In general the negative ions are of negligible fractional abundances. It has also been found that the time of ambipolar diffusion is shorter than the dynamical time, hence the magnetic field should be weakened in the central core as the central density increases to 72 = lo4 cmm3.

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Time dependent chemical study of contracting interstellar clouds. I. Abundances of nitrogen- and carbon-bearing molecules

Cited by 2 publications

References 42 publications

The chemical evolution in a model of contracting cloud

The chemical evolution in a model of contracting cloud

The evolution of charged particles in a model of contracting cloud

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