Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1158..153s&link_type=abstract
EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY: Proceedings of the International Conference. AIP Conference Proceedings, V
Astronomy and Astrophysics
Astrophysics
Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Star Formation, Spectroscopy And Spectrophotometry
Scientific paper
A series of emission bands in the mid-infrared, mainly at 3.3, 6.2, 7.6-7.8, 8.6 and 11.2 μm, have been ubiquitously observed in various astrophysical environments. They are originally termed unidentified infrared (UIR) bands and many previous studies based on laboratory experiments and theoretical quantum chemical calculations have lead us to the general consensus that the carriers of these features are carbonaceous materials, including polycyclic aromatic hydrocarbons (PAHs). The relative band strengths, the profiles and the peak positions of these features are expected to vary according to the different physical conditions of the carriers. Recent observational studies have revealed the variations in the spectral properties of the UIR bands among sources with different stellar spectral types. In this proceedings we plan to give a brief introduction of our latest observational studies on the properties and the spatial distribution of the UIR bands in several objects, including both the early-type (05-06) and the late-type (K2) stars based on observations with Cooled Mid-Infrared Camera and Spectrometer (COMICS) on board Subaru telescope.
Fujiyoshi Takuya
Kaneda Hidehiro
Kataza Hirokazu
Kimura Yuki
Okamoto Yoshiko
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