论文标题
Balmer-Alpha线的蓝翼碰撞效应
Collisional effects in the blue wing of the Balmer-alpha line
论文作者
论文摘要
为了研究Lyman-Alpha线的近翼，由于存在近距离卫星的不对称形状，因此需要准确的线轮廓计算和分子数据。在哈勃太空望远镜（HST）上观察到的lyman-alpha线在DBA和DA White Dwarf星的光谱中显示出这种特殊性。可以在He和H原子扰动的H扰动的Balmer-Alpha线中预测蓝翼中类似的不对称形状。在继续在Lyman-Alpha线上进行的一项最新工作，确定了n = 2个势能和从基态的过渡偶极矩，我们提出了与H（n = 3）+He（n = 3）+He（n = 3）+He（n = 3）+He（N = 2）相关的分子状态的新型精确的H-HE势能和电子过渡偶极矩（N = 2）+H = 2）这些新的数据和H（n = 2,3）-h的现有分子数据用于对He和H原子扰动H扰动的H Balmer-Alpha系的蓝翼进行理论研究。我们注意到在DZA白色矮人的凉爽气氛中发现的Balmer-Alpha线形状的后果，在该物理条件下，氦气密度可能高达10^21 cm-3。这项研究是通过光谱线扩大的统一理论在非常高的氦气密度下进行的。
In order to investigate the near wing of the Lyman-alpha line, accurate line profile calculations and molecular data are both required due to the existence of a close line satellite responsible for its asymmetrical shape. Lyman-alpha lines observed with the Cosmic Origin Spectograph (COS) on the Hubble Space Telescope ( HST) show this peculiarity in the spectra of DBA and DA white dwarf stars. A similar asymmetrical shape in the blue wing can be predicted in the Balmer-alpha line of H perturbed by He and H atoms. In continuation with a very recent work on the Lyman-alpha line, where the n=2 potential energies and transition dipole moments from the ground state were determined, we present new accurate H-He potential energies and electronic transition dipole moments involving the molecular states correlated with H(n=3)+He and their transition dipole moments with the states correlated with H(n=2)+He. Those new data and existing molecular data for H(n=2,3)-H are used to provide a theoretical investigation of the collisional effects in the blue wing of the Balmer-alpha line of H perturbed by He and H atoms. We note the consequences for the Balmer-alpha line shape in the physical conditions found in the cool atmosphere of DZA white dwarfs where helium densities may be as high as 10^21 cm-3. This study is undertaken with a unified theory of spectral line broadening valid at very high helium densities.
