Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934303d&link_type=abstract
American Astronomical Society, AAS Meeting #219, #343.03
Astronomy and Astrophysics
Astronomy
Scientific paper
Understanding the nature and formation of cosmic dust is crucial to understanding the Universe. Evolved intermediate mass stars (i.e. AGB stars) are major contributors of dust to the cosmos. Dust around AGB stars are studied by means of infrared spectroscopy from which we observe several interesting spectral features. The observed AGB star spectra have been classified according to their shapes and wavelength positions of the dust features. Alongside the main spectral features around 8-12 microns, there is an enigmatic 13 micron feature that appears in about half the oxygen-rich AGB stars. The carrier of this feature has not yet been unequivocally identified but has been attributed to various dust species, including corundum (crystalline Al2O3), spinel (MgAl2O4), and silica (SiO2). While there have been several attempts to determine the cause of this 13 micron feature, previous studies have been somewhat contradictory. Here we present data and parameters for a large sample of oxygen-rich AGB stars and determine whether the strength of the 13 micron feature is correlated with any of these stellar parameters such as mass-loss rate, proper motion, radial velocity, and period.
de Souza Nelson
Speck Angela Karen
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