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arXiv 0902.1144astro-ph.GA
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内星系2 MASS双色星际红化线

2MASS Two-Color Interstellar Reddening Lines in the Inner Galaxy

V. Straizys, V. Laugalys

摘要:

测定了内银河系(从狐狸座到半人马座)26个区域的2 MASS J-H-H-Ks图中星际红化线的斜率。在大多数研究方向上,E(J-H)/E(H-K_s)的比值在1.9和2.0之间,视消光小于12等的恒星,消光较大的恒星向下偏离红化较弱的恒星的红化线。这可能与带宽效应引起的红化线的曲率有关。然而,一些偏离的恒星可能是严重变红的富氧和富碳AGB星(最新M子类或N型碳星的巨星),以及前主序星(YSO)。

英文摘要:

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).

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