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Distance and reddening of the isolated dwarf irregular galaxy NGC 1156

机译：孤立的矮人不规则星系NGC 1156的距离和变红

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摘要

We present a photometric estimation of the distance and reddening values to the dwarf irregular galaxy NGC 1156, that is one of the best targets for the study of isolated dwarf galaxies in the nearby universe. We used imaging data sets of the Hubble Space Telescope (HST) Advanced Camera for Surveys, High Resolution Channel of the central region of NGC 1156 (26″ × 29″) available in the HST archive for this study. From the (U - B, B - V) color-color diagram, we first estimated the total (foreground + internal) reddening toward NGC 1156 of E(B - V) = 0.35±0.05 mag, whereas only the foreground reddening was previously known to be E(B - V) = 0.16 mag (1984, ApJS, 54, 33) or 0.24 mag (1998, ApJ, 500, 525). Based on the brightest-star method, selecting the three brightest blue supergiant (BSG) stars with a mean B magnitude of = 21.94 and the three brightest red supergiant (RSG) stars with a mean V magnitude of hV (3R)i = 22.76, we derived the distance modulus to NGC 1156 to be (m - M) _(0,BSG) = 29.16mag and (m-M) _(0,RSG) = 29.55 mag. By using weights of 1 for BSGs and 1.5 for RSGs, we finally obtained a weighted mean distance modulus to NGC 1156, (m-M/0 = 29.39±0.20mag (distance = 7.6±0.7Mpc), which is in agreement with previous estimates. Combining the photometry data of this study with those of Karachentsev, Musella, and Grimardi (1996, A&A, 310, 722) gives a smaller distance to NGC 1156, which is discussed together with the limits of the data.
机译：我们提出对不规则矮星系NGC 1156的距离和变红值的光度估计，这是研究附近宇宙中孤立矮星系的最佳目标之一。我们使用了哈勃太空望远镜（HST）的先进测量相机的成像数据集，该研究的HST档案中可用的NGC 1156中央区域的高分辨率通道（26“×29”）。从（UB-B，B-V）彩色图表中，我们首先估计E（B-V）= 0.35±0.05 mag的朝NGC 1156的总（前景+内部）发红，而之前仅前景发红已知为E（B-V）= 0.16 mag（1984，ApJS，54，33）或0.24 mag（1998，ApJ，500，525）。基于最亮恒星方法，选择平均B值 = 21.94的三颗最亮的蓝色超巨星（BSG）星和平均h值V大小的三颗最亮的红色超巨星（RSG）星（ 3R）i = 22.76，我们得出到NGC 1156的距离模量为（m-M）_（0，BSG）= 29.16mag和（mM）_（0，RSG）= 29.55 mag。通过使用BSG的权重为1，RSG的权重为1.5，我们最终获得了到NGC 1156的加权平均距离模量（mM / 0 = 29.39±0.20mag（距离= 7.6±0.7Mpc），与先前的估计一致。将这项研究的光度学数据与Karachentsev，Musella和Grimardi（1996，A＆A，310，722）的光度学数据相结合，得出与NGC 1156的距离更短，并与数据限制一起进行了讨论。

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