A new model for brown dwarf spectra including accurate unified line shape theory for the Na I and K I resonance line profiles
A new model for brown dwarf spectra including accurate unified line shape theory for the Na I and K I resonance line profiles
复制标题
棕矮星光谱的新模型，包括 Na I 和 K I 共振线剖面的精确统一线形理论
DOI：
10.1051/0004-6361:20031299
复制
发表时间：
2003
影响因子：
6.5
通讯作者：
L. Machin
中科院分区：
文献类型：
--
作者：
N. Allard;F. Allard;P. Hauschildt;J. Kielkopf;L. Machin
我们提出了第一个棕矮星大气模型，该模型基于对钠和钾在氦和分子氢扰动下的吸收剖面的理论计算。将合成光谱与以前用洛伦兹分布和经典范德华近似计算的光谱以及T矮星SDSS1624的观测光谱进行了比较。新的轮廓增加了甲烷棕矮星光谱的不透明度。然而，仅靠钾和钠的远翼不能解释0.85米到1.1米范围内缺失的不透明。
We present the first brown dwarf atmosphere models based on theoretical calculations of absorption profiles of sodium and potassium perturbed by helium and molecular hydrogen. The synthetic spectra have been compared to previous calculations with Lorentz profiles and the classic van der Waals approximation, and to the observed spectrum of the T dwarf SDSS 1624. The new profiles provide increased opacities in the optical spectra of methane brown dwarfs. However, the potas- sium and sodium far wings alone cannot explain the missing opacity in the 0.85 to 1.1m range.