文章基本信息

标题：The Araucaria Project: Multi-band Calibrations of the TRGB Absolute Magnitude
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作者：Marek Górski ; Grzegorz Pietrzyński ; Wolfgang Gieren 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2018
卷号：156
期号：6
页码：1-9
DOI：10.3847/1538-3881/aaeacb
语种：English
出版社：American Institute of Physics
摘要：We present new empirical calibrations of the absolute magnitude of the tip of the red giant branch (TRGB) in the optical I and near-infrared J, H, and K bands in terms of the (V− K) 0 , (V−H) 0 , and (J − K) 0 colors of the red giant branch (RGB). Our calibrations are based on the measurements in 19 fields in the Large and Small Magellanic Clouds, which span a wide (V −K) 0 color range of the brightest part of the RGB. We use a simple edge detection technique based on the comparison of the star count difference in two adjacent bins with the estimated Poisson noise. Further, we include the reddening and geometrical corrections, as well as the distance to the Large Magellanic Cloud that is precise and accurate to within 2%. The calibration based on (V− K) colors can be a robust tool to calculate the absolute magnitude of the TRGB with great precision.
关键词：distance scale;Magellanic Clouds;stars: distances;stars: late-type