On the basis of the near-infrared observations of bulge red clump stars near the Galactic center, we have determined the galactocentric distance to be R_0 = 7.52 ± 0.10(stat) ± 0.35 (sys)kpc. We observed the red clump stars at | l | approx< 1.0° and 0.7° approx< | b | approx< 1.0° with the IRSF 1.4 m telescope and the SIRIUS camera in the H and K_S bands. After extinction and population corrections, we obtained (m - M)_0 = 14.38 ± 0.03 (stat) ± 0.10 (sys). The statistical error is dominated by the uncertainty of the intrinsic local red clump stars' luminosity. The systematic error is estimated to be ± 0.10, including uncertainties in extinction and population correction, zero point of photometry, and the fitting of the luminosity function of the red clump stars. Our result, R_0 = 7.52 kpc, is in excellent agreement with the distance determined geometrically with the star orbiting the massive black hole in the Galactic center. The recent result based on the spatial distribution of globular clusters is also consistent with our result. In addition, our study exhibits that the distance determination to the Galactic center with the red clump stars, even if the error of the population correction is taken into account, can achieve an uncertainty of about 5%, which is almost the same level as that in recent geometrical determinations.
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机译：根据银河中心附近凸起的红色团块星的近红外观测，我们确定了半视距为R_0 = 7.52±0.10（stat）±0.35（sys）kpc。我们观察到| l |约<1.0°和0.7°约<| b |使用HSF和K_S波段的IRSF 1.4 m望远镜和SIRIUS相机，约<1.0°。经过灭绝和种群校正，我们获得了（m-M）_0 = 14.38±0.03（stat）±0.10（sys）。统计误差主要由固有的局部红团星的光度不确定性决定。系统误差估计为±0.10，包括消光和种群校正的不确定性，光度学的零点以及红团星的光度函数的拟合。我们的结果R_0 = 7.52 kpc，与恒星绕银河系中心巨大黑洞的轨道几何确定的距离非常吻合。基于球状星团的空间分布的最新结果也与我们的结果一致。此外，我们的研究表明，即使考虑到人口校正的误差，用红色团块星到银河系中心的距离测定也可以实现约5％的不确定性，这几乎与该水平相同。在最近的几何确定中。
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