| Project/Area Number |
01460010
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | Nagoya University |
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Principal Investigator |
NOGUCHI Kunio School of Science, Nagoya University, Assistant Professor, 理学部, 助手 (10111824)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUMOTO Toshio School of Science, Nagoya University, Professor, 理学部, 教授 (60022696)
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| Project Period (FY) |
1989 – 1990
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 1990: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1989: ¥4,300,000 (Direct Cost: ¥4,300,000)
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| Keywords | Late-type stars / Infrared spectral observations / Late stages of stellar evolution / Circumstellar dust / 特異炭素星 / S型星 |
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| Research Abstract |
The goal of the project is to examine the late stages of the stellar evolution by observing late-type stars and related astronomical objects in the infrared wavelength region. In this evolutional stages, late-type stars are believed to evolve through asymptotic giant branch stage to protoplanetary nebulae and then to planetary nebulae. In this process, mass loss from stars plays an important role. These stars, therefore, are covered with circumstellar dust envelopes(CDE)which are condenced from lost molecules. These stars are very bright in the infrared wavelength region due to the thermal omission from CDE.
Late-type stars are generally classified into three types of stars(0-rich stars, S-type stars, and Carbon stars)depending on the stellar atmospheric composition. Since the composition and characteristics of dust grains in CDE of these three types of stars are different from one another, infrared spectral characteristics for these stars give important information for examining the evolution of three types of stars separately. We carried out both photometric and spectral observations for these stars and have got valuable information on the evolution of late-type stars.
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