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Investigation of MgO as a candidate for the primary nucleating dust species around M stars

Bhatt, JS; Ford, IJ; (2007) Investigation of MgO as a candidate for the primary nucleating dust species around M stars. MON NOT R ASTRON SOC , 382 (1) 291 - 298. 10.1111/j.1365-2966.2007.12358.x.

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Abstract

The possibility of magnesium oxide being the first species to nucleate in the cooling outflows around M stars has been investigated. By treating the formation of the seed nuclei as a homogeneous nucleation problem and using molecular dynamics data obtained with the 'compressible ion potential' for MgO, free energy calculations are performed to obtain an estimate of the population densities of MgO clusters of various sizes. It is found that a free energy barrier of at least hundreds of k(B) T would need to be climbed in order for MgO to nucleate in significant amount in typical circumstellar shells, hence ruling out MgO as a realistic candidate for the primary nucleating dust species. This is in agreement with a similar conclusion reached in earlier studies, although the present calculations are based on a much more robust potential model for MgO.

Type: Article
Title: Investigation of MgO as a candidate for the primary nucleating dust species around M stars
DOI: 10.1111/j.1365-2966.2007.12358.x
Keywords: astrochemistry, circumstellar matter, VAPOR-PHASE NUCLEATION, REFRACTORY COMPOUNDS, STOCHASTIC APPROACH, CHEMICAL-KINETICS, STELLAR WINDS, CONDENSATION, POLARIZATION, INTERSTELLAR, SIMULATIONS, STABILITY
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Structural and Molecular Biology
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/86903
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