The Halo White Dwarf WD 0346+246 Revisited
The Halo White Dwarf WD 0346+246 Revisited
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光环白矮星 WD 0346 246 重访
DOI：
10.1086/322316
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
P. Bergeron
中科院分区：
文献类型：
--
作者：
P. Bergeron
本文重新研究了晕白色矮星WD 0346+246的富氦大气成分。从天体物理学的角度来看，当考虑到星际介质中的氢和金属的吸积时，这种解决方案是不可能的。另一种解决方案是提出了氢和氦是目前在大气中的地区在等量。在Teff = 3780 K，log g = 8.34，N（He）/N（H）= 1.3时，通过在模型计算中包括来自与氢原子的所谓溶解原子能级相关的莱曼边缘的束缚-自由不透明度或伪连续不透明度，可以得到最佳拟合。
The extremely helium-rich atmospheric composition determined for the halo white dwarf WD 0346+246 is reexamined. This solution is shown to be improbable from an astrophysical point of view when accretion of hydrogen and metals from the interstellar medium is taken into account. An alternate solution is proposed in which hydrogen and helium are present in the atmospheric regions in equal amounts. The best fit, at Teff = 3780 K, log g = 8.34, and N(He)/N(H) = 1.3, is achieved by including in the model calculations a bound-free opacity from the Lyman edge associated with the so-called dissolved atomic levels of the hydrogen atom, or pseudocontinuum opacity.