English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 78728/78728 (100%)
造訪人次 : 33541437      線上人數 : 1709
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋


    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/78218


    題名: 探討最年輕與最年老的棕矮星;Diagnosing the Youngest and Oldest Brown Dwarfs
    作者: 陳文屏
    貢獻者: 國立中央大學天文研究所
    關鍵詞: 天文觀測;恆星形成;星團;棕矮星;行星大氣;Astronomical Observation;Star Formation;Star Cluster;Brown Dwarf;Planetary Atmosphere
    日期: 2018-12-19
    上傳時間: 2018-12-20 11:11:40 (UTC+8)
    出版者: 科技部
    摘要: 我們擬在年輕星團與恆星形成區當中搜尋並研究次恆星,也就是棕矮星與質量與行星相當的天體。 我們將利用CFHT 配備新設計的W 濾鏡,以指認含有水汽的低溫大氣層。這樣的光度觀測提供高 效率而可靠的候選天體名單,以便後續使用大型望遠鏡的紅外光譜認證。大部分目前已知的次恆 星都限於太陽附近。而這裡提出的計畫將發現最完整、質量最低、年齡不到兩百萬年的氣體天體, 以探究它們的形成過程。我們也將清點鄰近星團拋射出的低質量成員,藉以研究星團瓦解的動力 過程。另一方面我們也將利用 Subaru/HSC 找出極微弱,也就是極度年老的棕矮場星,以探討缺 乏複雜元素的低溫大氣性質與年輕棕矮星的差別。 ;We propose to search for and to characterize substellar objects, i.e., brown dwarfs and planet-mass objects in young star clusters and star-forming regions. A customized W filter sensitive to the water absorption in infrared wavelengths will be used on the CFHT to identify candidates with molecule-bearing cool atmospheres. The imaging survey will provide an efficient and reliable list of brown dwarfs for spectroscopic conformation by large telescopes. Most substellar objects known so far are in the field in immediate solar neighborhood. The project proposed here will uncover the most comprehensive sample of the least massive gaseous cosmic bodies when they are less than a couple million years old, i.e., at the epoch of their infancy to shed light of their formation history in relevance to stellar counterparts. We will also conduct a census of low-mass members which have been dynamically ejected from nearby star clusters, thereby diagnosing the cluster disintegration process. We will also make use of the Subaru/HSC data to identify very faint, i.e., extremely old field, brown dwarfs, in order to contrast the metal-deficient cool atmospheres with those of the young population.
    關聯: 財團法人國家實驗研究院科技政策研究與資訊中心
    顯示於類別:[天文研究所] 研究計畫

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    index.html0KbHTML281檢視/開啟


    在NCUIR中所有的資料項目都受到原著作權保護.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 隱私權政策聲明