Based on archival Hubble Space Telescope images, we have performed stellar photometry for 18 dwarf galaxies. Branches of young and old stars are seen on the constructed Hertzsprung–Russell diagrams. Using the photometry of red giants and applying the TRGB method, we have determined accurate distances for all 18 galaxies for the first time. The galaxies AGC 238890 and AGC 747826 have minimum (D = 5.1 Mpc) and maximum (D = 12.0 Mpc) distances, respectively. The distances to the remaining galaxies lie within this range. Low-metallicity galaxies have been identified by measuring the color indices of the red giant branch: AGC 102728, AGC 198691, AGC 205590, AGC 223231, AGC 731921, and AGC 747826. We have determined the distance to AGC 198691 with a record low metallicity. Since AGC 223254, AGC 229053, AGC 229379, AGC 238890, AGC 731921, and AGC 742601 are projected onto the Virgo cluster of galaxies, the distances estimated by us together with the velocities of these galaxies measured previously at Arecibo can be used to refine the effect of galaxy infall to the Virgo cluster.

中文翻译：

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阿雷西博调查到18个矮星系的距离

根据档案哈勃太空望远镜的影像，我们对18个矮星系进行了恒星测光。在构造的Hertzsprung–Russell图上可以看到年轻和老星星的分支。使用红色巨人的光度法并应用TRGB方法，我们首次确定了所有18个星系的精确距离。星系AGC 238890和AGC 747826具有最小（D = 5.1 Mpc）和最大（D= 12.0 Mpc）距离。到其余星系的距离在此范围内。通过测量红色巨型分支的颜色指数，可以识别出低金属星系：AGC 102728，AGC 198691，AGC 205590，AGC 223231，AGC 731921和AGC 747826。 。由于将AGC 223254，AGC 229053，AGC 229379，AGC 238890，AGC 731921和AGC 742601投影到银河的处女座星团上，因此我们估算的距离以及这些星系的速度可用于先前在Arecibo测得的结果。银河对处女座星团的影响。