2 MASS在北美和鹈鹕星云方向的双色星际红化线与天鹅座OB2星协
2MASS Two-color Interstellar Reddening Line in the Direction of the North America and Pelican Nebulae and the Cyg OB2 Association
摘要：
测定了2 MASS巡天的J-H vs. H-Ks图中北美星云、鹈鹕星云、L935尘埃云和天鹅座OB 2星协方向的星际红化线的斜率。MK型可分为C. J. Corbally或从文献中收集。比值E（J-H）/E（H-Ks）= 2.0是由四组光谱类别的平均值得到的：O3-B1，B2-B6，B7-B9.5和红团簇巨星。所得比值大于“典型”值1.7-1.8。
英文摘要：
The slope of the interstellar reddening line in the J-H vs. H-Ks diagram of the 2MASS survey in the direction of the North America and Pelican nebulae, the L935 dust cloud and the Cyg OB2 association is determined. The MK types were either classified by C. J. Corbally or collected from the literature. The ratio E(J-H)/E(H-Ks) = 2.0 is obtained by taking the average for the four groups of spectral classes: O3--B1, B2--B6, B7--B9.5 and red clump giants. The obtained ratio is larger than the `typical' value, 1.7-1.8.
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