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arXiv 0902.1154astro-ph.GA
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2 MASS双色星际红化线的带宽效应

2MASS Two-Color Interstellar Reddening Lines: the Band-Width Effect

V. Straizys, R. Lazauskaite

摘要:

利用基于Kurucz模型大气的合成色指数和色余,研究了2 MASS巡天J-H vs. H-KS图中星际红化线的带宽效应。在大的星际红化(E(H-K_s)大于1.0)下,红化线明显偏离直线。这些线可以近似为方程:E(J-H)= r E(H-K_s)+ s E(H-K_s)^2,其中斜率系数r和曲率系数s略微依赖于源的内禀能量分布。由Straizys和Laugalys(2008)根据2 MASS观测绘制的J-H vs. H-K_s图证实了红化线的曲率。

英文摘要:

The band-width effect on interstellar reddening lines in the J-H vs. H-K_s diagram of the 2MASS survey is investigated using synthetic color indices and color excesses based on the Kurucz model atmospheres. At large interstellar reddenings (E(H-K_s) larger than 1.0) reddening lines deviate considerably from a straight line. The lines can be approximated by an equation: E(J-H) = r E(H-K_s) + s E(H-K_s)^2, where the slope coefficient, r, and the curvature coefficient, s, depend slightly on the intrinsic energy distribution of the source. The curvature of the reddening lines is confirmed by the J-H vs. H-K_s diagrams plotted by Straizys and Laugalys (2008) from 2MASS observations.

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