arXiv 1606.095862016-06-30astro-ph.SR

CHARA阵列解析长周期Wolf-Rayet二进制WR 137和WR 138

The CHARA Array resolves the long-period Wolf-Rayet binaries WR 137 and WR 138

Noel D. Richardson, Tomer Shenar, Olivier Roy-Loubier, Gail Schaefer, Anthony F. J. Moffat, Nicole St-Louis, Douglas R. Gies, Chris Farrington, Grant M. Hill, P… 展开作者

Noel D. Richardson, Tomer Shenar, Olivier Roy-Loubier, Gail Schaefer, Anthony F. J. Moffat, Nicole St-Louis, Douglas R. Gies, Chris Farrington, Grant M. Hill, Peredur M. Williams, Kathryn Gordon, Herbert Pablo, Tahina Ramiaramanantsoa

备注：: 11 pages, 4 tables, 7 figures, accepted to MNRAS
DOI：: 10.1093/mnras/stw1585

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摘要：

我们报告的干涉观测与CHARA阵列的两个经典的沃尔夫-拉叶星在可疑的二元系统，即WR 137和WR 138。在这两种情况下，我们都将恒星的组成部分分解为几毫角秒。这些数据是在H波段收集的，并提供了每个系统中两颗恒星的部分通量的测量。我们发现WR星是两个系统（$f_{\rm WR, 137} = 0.59\pm0.04$ ; $f_{\rm WR, 138} = 0.67\pm0.01$）中占主导地位的H波段光源，这是通过与WR星和O型矮星的估计基本参数的比较以及每个系统的光谱建模得到证实的。我们的光谱模型还提供了这些系统中恒星和风的基本参数。WR 138的结果提供了证据，证明它是一个双星系统，可能经历了先前的质量转移事件，创造了WR星。WR 137系统中恒星的分离和位置以及IOTA干涉仪先前的结果提供了证据，证明该双星几乎是在边缘上看到的。WR 137可能的边缘轨道与哈勃太空望远镜在之前的近星通过期间拍摄的尘埃产生地点很好地对齐，表明尘埃产生可能集中在轨道平面上。

英文摘要：

We report on interferometric observations with the CHARA Array of two classical Wolf-Rayet stars in suspected binary systems, namely WR 137 and WR 138. In both cases, we resolve the component stars to be separated by a few milliarcseconds. The data were collected in the H-band, and provide a measure of the fractional flux for both stars in each system. We find that the WR star is the dominant H-band light source in both systems ($f_{\rm WR, 137} = 0.59\pm0.04$; $f_{\rm WR, 138} = 0.67\pm0.01$), which is confirmed through both comparisons with estimated fundamental parameters for WR stars and O dwarfs, as well as through spectral modeling of each system. Our spectral modeling also provides fundamental parameters for the stars and winds in these systems. The results on WR 138 provide evidence that it is a binary system which may have gone through a previous mass-transfer episode to create the WR star. The separation and position of the stars in the WR 137 system together with previous results from the IOTA interferometer provides evidence that the binary is seen nearly edge-on. The possible edge-on orbit of WR 137 aligns well with the dust production site imaged by the Hubble Space Telescope during a previous periastron passage, showing that the dust production may be concentrated in the orbital plane.

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