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    题名: Searching;for Open Clusters in the Milky-Way Disk
    作者: 傅冠儒;Kuan-Ju Fu
    贡献者: 天文研究所
    关键词: open cluster;2MASS
    日期: 2008-06-30
    上传时间: 2009-09-22 10:13:39 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 我們對2MASS 點源目錄做星球計數,試圖找出銀盤上未被發現的星團。 我們將搜索的範圍限定在銀經90~270 度與銀緯-3.5~+3.5 度的天區,並且 避開已知星團區域,從中挑出星球密度相對突起的區域,再經由目視檢查 2MASS 的雙色圖及顏色星等圖與DSS 及2MASS 影像,最終列出數十個區域為 星團候選目標。對於每一個候選目標,已初步估算它們個別的中心座標、 視直徑及成員星數目。在此篇論文中,我們一共列出12 個星團候選目標, 其中OC0234+6147 及OC0456+4722 與雲氣有所聯繫,暗示它們可能是年輕 星團。此外,OC0536+3112 及OC0604+2201 已利用鹿林一米望遠鏡進一步地 取得可見光測光資料,估算出它們的距離分別為~1.82 kpc 及~3.27 kpc。 We present the results of star counting of the 2MASS point sources to search for uncharted open clusters. As the first attempt, we identified regions with stellar density enhancements not associated with previously known star clusters along the Galactic disk, within the band l = 90 degree to 270 degree, and b = -3.5 degree to +3.5 degree. Analysis of the 2MASS J-H versus H-Ks and J versus J-H diagrams, together with visual inspection of the DSS and 2MASS images, led to a final list of a few tens of regions as star cluster candidates, for each of which the central coordinates, angular size, projected stellar density profile, and total number of possible cluster members were derived. Details of a dozen such star cluster candidates are presented here. In particular two clusters, OC0234+6147 and OC0456+4722, are young and associated with nebulosity. We presented the two cluster observed by Lulin One-meter Telescope, OC0536+3112 and OC0604+2201, to photometrically derive their distances to be ~1.82 kpc and ~3.27 kpc, respectively.
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