白矮星巴耳末线的压力位移和引力红移。再论
Pressure Shift and Gravitational Red Shift of Balmer Lines in White Dwarfs. Rediscussion
摘要：
本文详细地研究了斯塔克引起的DA白矮星（WD）谱中$H_α$和$H_β$ Balmer线的位移和不对称性，即所谓的压移（PS），它是测量WD引力红移的掩蔽效应。这些结果与25年前的早期结果进行了比较（Grabowski et al. 1987，以下简称ApJ'87; Madej and Grabowski 1990）。在这些早期的论文中，作为Balmer线轮廓的主要组成部分，标准的、对称的Stark线轮廓，作为整体被PS效应移动，被应用于WD大气的所有光谱活性层。目前，在每个WD层中，斯塔克线轮廓（特别是$H_β$的斯塔克线轮廓）是内在不对称的，并且由于等离子体中的扰动场的强不均匀性的影响而移位。为了计算连续层的WD大气中的斯塔克线轮廓，我们使用了修改后的全计算机模拟方法（mFCSM），能够充分考虑到本地基本量子过程的复杂性等离子体。在$H_α$谱线的情况下，合成的$H_α$谱线轮廓的斯塔克引起的位移的当前值比以前的值（ApJ'87）小大约两倍，并且与重力红移相比可以忽略不计。在$H_β$谱线的情况下，合成的$H_β$谱线轮廓的斯塔克诱导位移的当前值比先前值大约两倍。这种额外位移的来源是$H_β$峰的不对称性。
英文摘要：
The Stark-induced shift and asymmetry, the so-called pressure shift (PS) of $H_α$ and $H_β$ Balmer lines in spectra of DA white dwarfs (WDs), as masking effects in measurements of the gravitational red shift in WDs, have been examined in detail. The results are compared with our earlier ones from before a quarter of a century (Grabowski et al. 1987, hereafter ApJ'87; Madej and Grabowski 1990). In these earlier papers, as a dominant constituent of the Balmer-line-profiles, the standard, symmetrical Stark line profiles, shifted as the whole by PS-effect, were applied to all spectrally active layers of the WD atmosphere. At present, in each of the WD layers, the Stark-line-profiles (especially of $H_β$) are immanently asymmetrical and shifted due to the effects of strong inhomogeneity of the perturbing fields in plasma. To calculate the Stark line-profiles in successive layers of the WD atmosphere we used the modified Full Computer Simulation Method (mFCSM), able to take adequately into account the complexity of local elementary quantum processes in plasma. In the case of the $H_α$ line, the present value of Stark-induced shift of the synthetic $H_α$ line-profile is about twice smaller than the previous one (ApJ'87) and it is negligible in comparison with the gravitational red shift. In the case of the $H_β$ line, the present value of Stark-induced shift of the synthetic $H_β$ line-profile is about twice larger than the previous one. The source of this extra shift is the asymmetry of $H_β$ peaks.
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