| Project/Area Number |
12440054
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Kyoto Pharmaceutical University |
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Principal Investigator |
KOIKE Chiyoe Kyoto Pharmaceutical University, Pharmacy, Professor, 薬学部, 教授 (20097835)
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| Co-Investigator(Kenkyū-buntansha) |
TSUCHIYAMA Akira Osaka University, Earth and Space Science, Professor, 大学院・理学研究科, 教授 (90180017)
FUKADA Mamoru Kyoto Pharmaceutical University, Pharmacy, Assistant Professor, 薬学部, 助教授 (00097841)
UMEMOTO Koichiro Kyoto Pharmaceutical University, Pharmacy, Assistant, 薬学部, 助手 (80097831)
OKUDA Haruyuki Gunma Astronomical Observatory, Associate Director, 副台長 (50025293)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥16,500,000 (Direct Cost: ¥16,500,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2000: ¥11,000,000 (Direct Cost: ¥11,000,000)
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| Keywords | crystalline silicates / circumstellar dust / interstellar dust / infrared spectra / infrared astronomy / far infrared / Mg-rich silicates / optical properties / forsterite / pyroxene / 吸収係数 / 結晶性シリケイト / 星間・星周塵 / 反射率 / 中間赤外 / ピーク波長 |
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| Research Abstract |
Since the observation of ISO (Infrared Space of Observatory), crystalline silicates were detected every where in circumstellar of young objects and evolved objects. These facts are contradicts against the traditional idea of amorphous dust. In order to make clear the evolution of dust material and mass quantity of dust, the good data of optical properties of various materials are needed. But, only few data can be published. Crystalline silicates are Mg-rich such as forsterite Mg_2SiO_4 and enstatite MgSiO_3. Cooling olivine and pyroxene particles to liquid helium temperature the peak positions are shifted to shorter wavelength and peaks become sharper. This is the same results of observation, which the spectra showed the sharp peaks and circumstellar dust exist in low temperature as several 10 K. In universe, Mg elements and Fe elements are equally exist. So, it is very important to study how the spectra depend on Mg/Fe ratio. With our measurements of infrared spectra of olivine and pyroxene, the spectra were depend on Mg/Fe ratio, and peak positions are shifted to longer wavelength as Mg content decreases. Particularly, end members are very sensitive to Mg/Fe ratio, and peak shifts are drastically changed as this ratio. We detected diopside around evolved objects comparing with observed broad band at about 65 μm and laboratory measured data. This broad band was thought to originate to water ice, but water ice shows peak at around 62 μm even cooled to various temperature. Since our detected diopside, many workers noticed both of high and low temperature condensation minerals, and some group detected carbonate minerals such as calcite and dolomite. Recently, many new discover of minerals according to condensation theory are showed, and identification of observed bands and evolution of materials are very interesting.
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