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題 名 | 利用二微米巡天計畫研究主序星在近紅外波段的色指數=The NIR Colors of Main Sequence Stars in 2MASS |
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作 者 | 彭定弘; 高仲明; | 書刊名 | 臺北天文館學報 |
卷 期 | 8 2010.12[民99.12] |
頁 次 | 頁8-14 |
分類號 | 323.83 |
關鍵詞 | 二微米巡天計畫; 雙色指數圖; 2MASS; Color-color diagram; |
語 文 | 中文(Chinese) |
中文摘要 | 二微米巡天計畫(2MASS)是一個近紅外波段的全天觀測。如果可以判斷星的光譜型,讓我們有機會去利用其點源目錄(Point Source Catalogue)找出全天主序星的質量函數。Bessell & Brett (1988)列出約四十種不同光譜型主序星和巨星的近紅外本質色指數(intrinsic color)。然而,Finlator et al. (2000)提到不同光譜型的星有相似的紅外色指數,導致只靠2MASS的色指數很難判斷光譜型。我們利用密西根目錄(Michigan Catalogue, 1975, 1978, 1982, 1988, 1999)上面的主序星,嘗試建立一個準則,從二微米巡天計畫的點源目錄裡找主序星的光譜型。 |
英文摘要 | 2MASS (Two Micron All Sky Survey) is an all sky NIR survey. Its PSC (point source catalogue) gives us an opportunity to find the mass function of main sequence stars across the sky, provided that we can identify the spectral type of the stars. Beseell & Brett (1988) have listed the intrinsic colors of main sequences and giants which are divided by about 40 spectral types. However, as pointed out by Finlator et al. (2000), the stars of different spectral types have similar infrared colors so that the classification of spectral types based on 2MASS (and NIR data in general) is difficult. Using the Michigan Catalogues (1975, 1978, 1982, 1988, 1999) on spectral types of main sequence stars, we attempt to find an empirical scheme to identify the spectral type of main sequence stars from PSC of 2MASS. |
本系統中英文摘要資訊取自各篇刊載內容。