Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347..594g&link_type=abstract
Astronomy and Astrophysics, v.347, p.594-616 (1999)
Astronomy and Astrophysics
Astrophysics
123
Stars: Circumstellar Matter, Stars: Mass-Loss, Stars: Agb And Post-Agb
Scientific paper
This paper considers the growth of circumstellar dust grains formed from the elements silicon, magnesium, and iron. The stability of olivine (Mg2xFe_{2(1-x)}SiO_4), quartz (SiO_2), iron, and periclase (MgO) dust in a circumstellar environment is discussed. The role of exchange of Fe(2+) and Mg(2+) cations, solid diffusion of Fe(2+) cations within the SiO_4 matrix of the silicate lattice, and annealing of an initially amorphous lattice structure during olivine growth is considered. The complete set of equations describing the vapourisation and growth of a mixture of olivine, quartz, iron, and periclase grains, including the internal diffusion and the surface exchange processes, is derived. These equations are solved for a simplified model of a stellar wind for the case of an M star. The calculation shows that for M stars the dust in the circumstellar shell is a multicomponent mixture dominated by olivine and iron grains. Olivine grains likely show variations of their magnesium and iron content between the core and the surface. Some periclase and a tiny fraction of quartz also are formed in the outflow.
Gail Hans-Peter
Sedlmayr Erwin
No associations
LandOfFree
Mineral formation in stellar winds. I. Condensation sequence of silicate and iron grains in stationary oxygen rich outflows does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mineral formation in stellar winds. I. Condensation sequence of silicate and iron grains in stationary oxygen rich outflows, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mineral formation in stellar winds. I. Condensation sequence of silicate and iron grains in stationary oxygen rich outflows will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1617259