2mass Two-Color Interstellar Reddening Lines in the Inner Galaxy
2mass Two-Color Interstellar Reddening Lines in the Inner Galaxy
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发表时间：
2009-02
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通讯作者：
V. Straižys;V. Laugalys
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作者：
V. Straižys;V. Laugalys
在2MASS J-H-H-Ks图中确定了内银河系26个区域(从Vulecula到半人马座)星际红线的斜率。为此，我们使用位于旋臂内部和后面的红团巨星，或位于局部旋臂密集尘埃云后面的红团巨星。在所研究的大多数方向上，视消光小于12mag的恒星的E(J-H)/E(H-K_S)的比值在1.9到2.0之间。消光程度较大的恒星偏离了与变红程度较低的恒星相对应的变红线。这可能与带宽效应引起的红线曲率有关。然而，一些偏离恒星可能是严重变红的富含氧气和碳的AGB星(最新的M亚类或N型碳星的巨星)，以及主序前天体(YSO)。
The slopes of interstellar reddening lines in the 2MASS J-H versus H-Ks diagrams for 26 areas in the inner Galaxy (from Vulpecula to Centaurus) are determined. For this aim we use the red-clump giants located inside and behind spiral arms, or behind dense dust clouds of the Local arm. In most of the investigated directions the ratio E(J-H)/E(H-K_s) is found to be between 1.9 and 2.0, taking the stars with the visual extinction less than 12 mag. The stars with larger extinction deviate down from the reddening lines corresponding to less reddened stars. Probably, this is related to the curvature of reddening lines due to the band-width effect. However, some of the deviating stars may be heavily reddened oxygen- and carbon-rich AGB stars (giants of the latest M subclasses or N-type carbon stars), and pre-main-sequence objects (YSOs).