Reddening map of the Large Magellanic Cloud bar region
Reddening map of the Large Magellanic Cloud bar region
复制标题
大麦哲伦星云条区域的变红地图
DOI：
10.1051/0004-6361:20041279
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发表时间：
2004
影响因子：
6.5
通讯作者：
A. Subramaniam
中科院分区：
文献类型：
--
作者：
A. Subramaniam
本文给出了大麦哲伦星云棒区1123个位置的E（V-I）红化值。利用LMC光学引力透镜实验II星表中发现的红团簇星的V、I测光值估算红化。$E（V-I）$值被估计为在给定区域中的红丛种群的$（V-I）$的观察值和特征值之间的差。据发现，酒吧中的大部分区域的红化值小于0.1马格只有少数位置具有超过0.2马格的值。酒吧的东侧被发现是更红化时相比，西侧，与类似的和相对较小的值差异红化的酒吧的大部分地区。沙洲东端的增红可能是由视线中的一小部分H I云引起的。高密度的HI云位于酒吧的东端应该造成了非常高的红化在这些地区，而只有一个相对较小的增加红化的估计。这表明，在这个方向上的大部分H I云可能位于酒吧后面。
$E(V-I)$ reddening values for 1123 locations in the bar region of the Large Magellanic Cloud are presented. V , I photometry of red clump stars identified in the Optical Gravitational Lensing Experiment II catalogue of LMC were used to estimate reddening. $E(V-I)$ values were estimated as the difference between observed and the characteristic values of $(V-I)$ for the red clump population in a given region. It is found that most of the regions in the bar have reddening values less than 0.1 mag with only a few locations having values more than 0.2 mag. The eastern side of the bar is found to be more reddened when compared to the western side, with similar and relatively small values for differential reddening as in most parts of the bar. Increased reddening in the eastern end of the bar could be caused by a small fraction of the H I clouds in the line of sight. A high density of HI clouds located in the eastern end of the bar should have caused very high reddening in these regions, whereas only a relatively small increase in the reddening is estimated. This indicates that most of the H I clouds in this direction are likely to be located behind the bar.