Potsdam Wolf-Rayet model atmosphere grids for WN stars
Potsdam Wolf-Rayet model atmosphere grids for WN stars
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DOI：
10.1051/0004-6361/201526253
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发表时间：
2015-07
影响因子：
6.5
通讯作者：
H. Todt;A. Sander;R. Hainich;W. Hamann;M. Quade;T. Shenar
中科院分区：
文献类型：
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作者：
H. Todt;A. Sander;R. Hainich;W. Hamann;M. Quade;T. Shenar
我们提出了新的波茨坦Wolf-Rayet(POWR)模型大气网格，用于氮序列的Wolf-Rayet星(WN星)。这些模型是用最新版本的POWR恒星大气程序计算的球面恒星风。WN模型大气包括复模型原子统计方程的非LTE解，以及同动坐标系下的辐射传输方程。铁线覆盖用超水平方法来处理，而风的不均匀则通过光学薄团来考虑。我们的三个模型网格适合银河系的金属丰度。这些格子的氢质量分数分别为50%、20%和0%，因此也涵盖了近年来发现的富氢晚型WR星。三个网格对于LMC WN恒星来说是足够的，它们的氢分数分别为40%、20%和0%。最近，又增加了具有SMC金属度和60%、40%、20%和0%氢的栅格。我们提供了通常用于分类和诊断的光谱线的等效宽度的等高线图。
We present new grids of Potsdam Wolf-Rayet (PoWR) model atmospheres for Wolf-Rayet stars of the nitrogen sequence (WN stars). The models have been calculated with the latest version of the PoWR stellar atmosphere code for spherical stellar winds. The WN model atmospheres include the non-LTE solutions of the statistical equations for complex model atoms, as well as the radiative transfer equation in the co-moving frame. Iron-line blanketing is treated with the help of the superlevel approach, while wind inhomogeneities are taken into account via optically thin clumps. Three of our model grids are appropriate for Galactic metallicity. The hydrogen mass fraction of these grids is 50%, 20%, and 0%, thus also covering the hydrogen-rich late-type WR stars that have been discovered in recent years. Three grids are adequate for LMC WN stars and have hydrogen fractions of 40%, 20%, and 0%. Recently, additional grids with SMC metallicity and with 60%, 40%, 20%, and 0% hydrogen have been added. We provide contour plots of the equivalent widths of spectral lines that are usually used for classification and diagnostics.