In this paper, we present corrections to the spectroscopic parameters of DB and DBA white dwarfs with -10.0 < log(H/He) < -2.0, 7.5 < log(g) < 9.0 and 12000 K < T_eff < 34000 K, based on 282 3D atmospheric models calculated with the CO5BOLD radiation-hydrodynamics code. These corrections arise due to a better physical treatment of convective energy transport in 3D models when compared to the previously available 1D model atmospheres. By applying the corrections to an existing SDSS sample of DB and DBA white dwarfs, we find significant corrections both for the effective temperature and surface gravity. The 3D log(g) corrections are most significant for T_eff < 18000 K, reaching up to -0.20 dex at log(g) = 8.0. However, in this low effective temperature range, the surface gravity determined from the spectroscopic technique can also be significantly affected by the treatment of the neutral van der Waals line broadening of helium and by non-ideal effects due to the perturbation of helium by neutral atoms. Thus, by removing uncertainties due to 1D convection, our work showcases the need for improved description of microphysics for DB and DBA model atmospheres. Overall, we find that our 3D spectroscopic parameters for the SDSS sample are generally in agreement with Gaia DR2 absolute fluxes within 1-3{\sigma} for individual white dwarfs. By comparing our results to DA white dwarfs, we have determined that the precision and accuracy of DB/DBA atmospheric models are similar. For ease of user application of the correction functions, we provide an example Python code.

中文翻译：

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氦线白矮星的 3D 光谱分析

在本文中，我们对 DB 和 DBA 白矮星的光谱参数进行了修正，其中 -10.0 < log(H/He) < -2.0, 7.5 < log(g) < 9.0 和 12000 K < T_eff < 34000 K，基于使用 CO5BOLD 辐射流体动力学代码计算的 282 个 3D 大气模型。与之前可用的 1D 模型大气相比，3D 模型中的对流能量传输进行了更好的物理处理，因此出现了这些修正。通过将校正应用于 DB 和 DBA 白矮星的现有 SDSS 样本，我们发现有效温度和表面重力都有显着的校正。3D log(g) 校正对于 T_eff < 18000 K 最为重要，在 log(g) = 8.0 时达到 -0.20 dex。然而，在这个低有效温度范围内，由光谱技术确定的表面重力也可能受到氦的中性范德华线加宽处理和由于中性原子对氦的扰动导致的非理想效应的显着影响。因此，通过消除一维对流引起的不确定性，我们的工作表明需要改进 DB 和 DBA 模型大气的微物理描述。总体而言，我们发现我们的 SDSS 样本的 3D 光谱参数通常与单个白矮星的 1-3{\sigma} 内的 Gaia DR2 绝对通量一致。通过将我们的结果与 DA 白矮星进行比较，我们确定 DB/DBA 大气模型的精度和准确度是相似的。为了便于用户应用校正函数，我们提供了一个示例 Python 代码。