论文标题
在本地体积星系中搜索LBV：在NGC 1156中对两颗星的研究
Search for LBVs in the Local Volume galaxies: study of two stars in NGC 1156
论文作者
论文摘要
我们继续搜索局部体积星系中的发光蓝色变量（LBV），以研究其基本参数。在本文中，我们报告了矮人不规则的星系NGC 1156中发现了两个新LBV。这两颗恒星同时表现出光谱可变性，并具有较强的亮度变化：$δ\ text {r} _c = 0.84 \ pm $ 0.23^m $ y $ $ $ $ $ $ $ $ 2.59 \ pm 0.10^m $ for J025941.54+251421.8。星星的骨仪仪位于l $ _ \ text {bol} \大约（0.8-1.6）\ times 10^6 $ l $ _ \ odot $的范围内。这些值可以纠正$ _ \ text {v} \大约0.9 $，并给予Galaxy d = 7.0 $ \ pm $ 0.4 MPC的距离，我们已经通过TRGB方法对其进行了测量。这两颗恒星在相对较低的温度区域中都高于Humphreys-Davidson的限制，T $ _ \ text {eff} \ Lessim 10 $ kk在温度 - 轻度图上。 J025941.54+251421.8在最大亮度下的温度低于氢离子化阈值，表现出与2012年爆发期间已知LBV R71的行为非常相似。我们估计了检测到的LBV的质量，并研究了其恒星环境的性质。我们在LBV的单星和二进制系统演化方案的框架内讨论了我们的结果。
We continue the search for luminous blue variables (LBVs) in Local Volume galaxies in order to study their fundamental parameters. In this paper, we report the discovery of two new LBVs in the dwarf irregular galaxy NGC 1156. Both stars exhibit spectral variability simultaneously with strong brightness variations: $Δ\text{R}_c = 0.84 \pm 0.23^m$ for J025941.21+251412.2 and $Δ\text{R}_c = 2.59 \pm 0.10^m$ for J025941.54+251421.8. The bolometric luminosities of the stars are in the range of L$_\text{Bol} \approx (0.8 - 1.6) \times 10^6$ L$_\odot$. These values are corrected for reddening A$_\text{V} \approx 0.9$ and are given for the distance to the galaxy D=7.0$\pm$0.4 Mpc, which we have measured by the TRGB method. Both stars are above the Humphreys-Davidson limit in the region of relatively low temperatures, T$_\text{eff} \lesssim 10$ kK on the temperature-luminosity diagram. J025941.54+251421.8 had a temperature below the hydrogen ionisation threshold at maximum brightness, exhibiting behaviour very similar to that of the known LBV R71 during its 2012 outburst. We have estimated the masses of the detected LBVs and studied the properties of their stellar environment. We discuss our results within the framework of both a single star and a binary system evolution scenario for LBVs.
