Evolving optical properties of annealing silicate grains: From amorphous condensate to crystalline mineral

被引：89

作者：

Hallenbeck, SL

Nuth, JA

Nelson, RN

机构：

[1] NASA, Goddard Space Flight Ctr, Astrochem Branch, Greenbelt, MD 20771 USA

[2] Georgia So Univ, Dept Chem, Statesboro, GA 30460 USA

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 535卷 / 01期

关键词：

circumstellar matter; dust; extinction; ISM : molecules; methods : laboratory; molecular processes;

D O I：

10.1086/308810

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Laboratory studies of the evolution of a magnesium silicate smoke from an amorphous condensate to a crystalline mineral by annealing in vacuum provide a foundation for the development of a silicate evolution index (SEI). The SEI can be used to predict the emergent IR spectrum of silicate dust in a circumstellar shell based on the time-temperature history of the silicate grains in the outflow. Optical constants for the magnesium silicate smoke samples compatible with those of Draine & Lee are derived over the range 0.001-1000 mu m.

引用

页码：247 / 255

页数：9

共 15 条

[1]

CHEESEMAN P, 1989, RP1217 NASA

[2] AXISYMMETRICAL MODELS OF CIRCUMSTELLAR DUST SHELLS [J].