中大機構典藏-NCU Institutional Repository-提供博碩士論文、考古題、期刊論文、研究計畫等下載:Item 987654321/50844
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 70548/70548 (100%)
造访人次 : 23127231      在线人数 : 236
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50844


    题名: A multiwavelength polarimetric study towards the open cluster NGC 1893
    作者: Eswaraiah,C;Pandey,AK;Maheswar,G;Medhi,BJ;Pandey,JC;Ojha,DK;Chen,WP
    贡献者: 天文研究所
    关键词: OPTICAL POLARIZATION OBSERVATIONS;MAIN-SEQUENCE STARS;WAVELENGTH DEPENDENCE;INTERSTELLAR GRAINS;MAXIMUM POLARIZATION;OB ASSOCIATIONS;REGION;EXTINCTION;PHOTOMETRY;NGC-1893
    日期: 2011
    上传时间: 2012-03-27 18:11:18 (UTC+8)
    出版者: 國立中央大學
    摘要: We present multiwavelength linear polarimetric observations for 44 stars of the NGC 1893 young open cluster region along with V-band polarimetric observations of stars of four other open clusters located between l similar to 160 degrees and 175 degrees. We found evidence for the presence of two dust layers located at a distance of similar to 170 and similar to 360 pc. The dust layers produce a polarization P(V) similar to 2.2 per cent. It is evident from the clusters studied in this work that, in the Galactic longitude range from l similar to 160 degrees to 175 degrees and within the Galactic plane (vertical bar b vertical bar < 2 degrees), the polarization angles remain almost constant, with a mean of similar to 163 degrees and a dispersion of 6 degrees. The small dispersion in polarization angle could be due to the presence of a uniform dust layer beyond 1 kpc. Present observations reveal that in the case of NGC 1893, the foreground two dust layers, in addition to the intracluster medium, seem to be responsible for the polarization effects. It is also found that towards the direction of NGC 1893, the dust layer that exists between 2 and 3 kpc has a negligible contribution towards the total observed polarization. The weighted mean for percentage of polarization (P(max)) and the wavelength at maximum polarization (lambda(max)) are found to be 2.59 +/- 0.02 per cent and 0.55 +/- 0.01 mu m, respectively. The estimated mean value of lambda(max) indicates that the average size of the dust grains within the cluster is similar to that in the general interstellar medium. The spatial variation of the polarization is found to decrease towards the outer region of the cluster. In this work, we support the notion, as has already been shown in previous studies, that polarimetry, in combination with the (U - B)-(B - V) colour-colour diagram, is a useful tool for identifying non-members in a cluster.
    關聯: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    显示于类别:[天文研究所] 期刊論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    index.html0KbHTML455检视/开启


    在NCUIR中所有的数据项都受到原著作权保护.

    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 ©   - 回馈  - 隱私權政策聲明