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題 名 | Comets Prancing around Dying Stars?=慧星狂舞於白矮星畔? |
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作 者 | 朱有花; | 書刊名 | 臺北天文館學報 |
卷 期 | 6 2008.12[民97.12] |
頁 次 | 頁1-7 |
分類號 | 323.6 |
關鍵詞 | 慧星; 白矮星; |
語 文 | 英文(English) |
英文摘要 | White dwrafs (WDs) are the final evolutionary product of stars similar to our Sun. Astronomers have been searching for planets and dust disks around WDs using excess infrared (IR) emission as diagnostics. Most searches have been using near-IR observations for WDs of temperatures a few 104 K. Recent Spitzer Space Telescope observations of the Helix Nebula revealed a bright mid-IR source at its central star, a 110,000 K hot WD. This mid-IR source has been analyzed and shown to originate from a dust disk at 50-100 AU from the star. This dust disk is most likely produced by collisions among Kuiper-Belt-like objects, or comets. To determine whether the Helix central star is unique, we have surveyed a large number of hot WDs and found several objects that show similar mid-IR excesses. Interestingly, they are all associated with planetary nebulae. Do they all have comets prancing around the central dying stars? At least one WD may have a companion accreting the mass loss from its progenitor. Follow-up observations will be made to solve this puzzle. |
本系統中英文摘要資訊取自各篇刊載內容。