Model Atmosphere Analysis of Two Very Cool White Dwarfs
Model Atmosphere Analysis of Two Very Cool White Dwarfs
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DOI：
10.1086/343795
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发表时间：
2002-07
期刊：
影响因子：
--
通讯作者：
P. Bergeron;S. Leggett
中科院分区：
文献类型：
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作者：
P. Bergeron;S. Leggett
本文详细分析了非常冷的白色矮星SDSS 1337+00和LHS 3250。改进的碰撞引起的氢分子吸收的模型大气计算表明，可以排除纯氢成分，并且在这些冷恒星中观察到的强红外吸收可以更好地解释为H2与中性氦的碰撞。结果表明，即使观察到的能量分布的整体形状可以合理地再现与富氦模型，6000欧姆附近的能量分布的峰值总是预测太窄。极端氦丰富的组合物推断这两个对象进行了讨论，在更广泛的背景下，非常冷的白色矮星在各种调查报告。
A detailed analysis of the very cool white dwarfs SDSS 1337+00 and LHS 3250 is presented. Model atmosphere calculations with improved collision-induced absorptions by molecular hydrogen indicate that a pure hydrogen composition can be ruled out and that the strong infrared absorption observed in these cool stars is better explained in terms of collisions of H2 with neutral helium. It is shown that even though the overall shape of the observed energy distributions can be reproduced reasonably well with helium-rich models, the peak of the energy distribution near 6000 Å is always predicted too narrow. The extreme helium-rich composition inferred for both objects is discussed in the broader context of the extremely cool white dwarfs reported in various surveys.