Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725015g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #250.15; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Crystalline olivine minerals (Mg2xFe(2-2x)SiO4 ; x=[0,1] ) has been detected in many astronomical environments. The Infrared Space Observatory (ISO), Spitzer Space Telescope, Herschel Space Telescope detected several sharp near and far infrared (IR) spectral features around young stars, comets and evolved stars, which have been attributed to crystalline silicates (mostly as forsterite, Mg2SiO4, the Mg-rich end member of the olivine series). Laboratory measurements of the different mineral spectral features are compared to astronomical observations in order to match and identify the dust species present in circumstellar envelopes. However, the positions, widths and amplitudes of the spectral features are strongly influenced by the temperature and composition of the dust grains. Consequently there is degeneracy such that a given spectral feature may have more than one explanation. We present these competing effects for crystalline olivine minerals and investigate how the spectral features change in position, shape and strength with varying Mg/[Mg+Fe] ratio and with temperature and develop a scheme for mapping the degeneracy space. Our goal is to determine to what extent this degeneracy can be broken observationally in order to improve our understanding of astromineralogy around the evolved stars.
Dijkstra Camelia
Guha Niyogi Suklima
Speck Angela
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