研究生: |
溫杰勳 |
---|---|
論文名稱: |
古德帶是否為環狀構造 |
指導教授: |
傅學海
Fu, Hsieh-Hai |
學位類別: |
碩士 Master |
系所名稱: |
地球科學系 Department of Earth Sciences |
論文出版年: | 2001 |
畢業學年度: | 89 |
語文別: | 中文 |
中文關鍵詞: | 古德帶 、恆星運動 |
論文種類: | 學術論文 |
相關次數: | 點閱:117 下載:0 |
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本研究是採用Hipparcos星表,以500 pc內的O、B星做為對象,分析其位置的空間分布和速度的分布,並且和Guillout et al.(1998)所提出古德帶模式相互比較,來探討古德帶(Gould Belt)可能呈現的結構。
首先,把條件不適合的O、B星刪除,並且對各種不同情況做討論,並且對每一顆符合條件的O、B星畫出以太陽為中心的二維空間分布圖,並以100 pc為間距,再畫出每個區間的空間分布圖。再利用300 pc的空間分布圖和前面所提及的模式做比較,發現古德帶的環狀結構可能比模式所推測的還要近似盤狀。
下一步把符合條件的徑向速度資料換算成空間速度分布,並且和前面的模式相比較之下,換算出古德帶相較於銀河盤面的傾角和其長軸的銀經方向,發現其值分別為18度及33.9度。相比較之下,此結果和前人所得到的結果相近,表示古德帶的環狀(ring)結構相近於前人所推測之構造。
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