著者

坂田 朗 和田 節子

出版者

THE CARBON SOCIETY OF JAPAN

雑誌

炭素 (ISSN:03715345)

巻号頁・発行日

vol.1989, no.138, pp.150-160, 1989-07-05 (Released:2010-06-28)

参考文献数

15

被引用文献数

1

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Recently astronomical observation revealed that optical properties of interstellar dusts in galaxies nearby our Galaxy shows gradual variation of optical properties closely related to their stage of galactic growth. The average interstellar extinction curves of Small Magellanic Cloud (SMC), Large Magellanic Cloud (LMC), and our Galaxy are summarized with astronomical observations of artificial satellites. An extinction curve of SMC, the youngest of them, showed smooth feature from far UV to near IR. But that of our Galaxy, the oldest of them, showed a large hump peaked at 220 nm. In this paper we discussed evolution of carbonaceous dusts in galactic growth.With high resolution observation of IR spectrum near our solar system, a life of carbonaceous dusts were clarified. The carbonaceous dusts were formed in circumstellar space of carbon rich aged stars and then they were expelled into interstellar space to be interstellar dusts. After the long residence in interstellar space the dusts were condensed in a dark cloud to form a protostar. In aged stage of dusts there are at least three substages such as dark cloud stage, protostellar stage, T Tauri stage and so on. The spectral changes of their carbonaceous dusts in these stages were summarized.