EDP Sciences
Free access
Volume 429, Number 1, January I 2005
Page(s) 205 - 208
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20041365

A&A 429, 205-208 (2005)
DOI: 10.1051/0004-6361:20041365

Crystalline Mg $\mathsf{_{2}}$SiO $\mathsf{_{4}}$ and amorphous Mg-bearing silicate grain formation by coalescence and growth

K. Kamitsuji1, H. Suzuki1, Y. Kimura2, T. Sato1, Y. Saito3 and C. Kaito1

1  Department of Nanophysics in Frontier Projects, Ritsumeikan University, Kusatsu-shi, Shiga 525-8577, Japan
    e-mail: rp007988@se.ritsumei.ac.jp
2  Laboratory for Extraterrestrial Physics, Code 691, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
3  Department of Electronics and Information Science, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

(Received 28 May 2004 / Accepted 23 August 2004 )

A novel method for producing MgO and SiO 2 smokes was developed. Mg-bearing silicate grain formation using the coalescence and growth of MgO and SiO 2 grains was carried out in our laboratory. It becomes evident that single and poly crystalline Mg 2SiO 4 (forsterite) and amorphous Mg-bearing silicate grains can be produced by the coalescence and growth of MgO and SiO 2 grains. This result suggests that the observed crystalline Mg 2SiO 4 grains and amorphous Mg-bearing silicate particles in Red Super Giant (RSG), Asymptotic Giant Branch (AGB), post-AGB and planetary nebula (PNe) could be produced by the coalescence and growth of MgO and SiO 2 grains.

Key words: astrochemistry -- methods: laboratory -- stars: AGB and post-AGB -- circumstellar matter -- dust, extinction

© ESO 2004