A spectroscopic determination of the mass distribution of DA white dwarfs
A spectroscopic determination of the mass distribution of DA white dwarfs
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DOI：
10.1007/978-94-011-3230-5_8
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发表时间：
1992-07
期刊：
影响因子：
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通讯作者：
P. Bergeron;R. Saffer;J. Liebert
中科院分区：
文献类型：
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作者：
P. Bergeron;R. Saffer;J. Liebert
DA白色矮星的质量分布的先前测定被证明是敏感的输入物理和假设的大气成分。本文提出了一种新的质量分布，它是基于观测到的氢谱线轮廓与理论模型谱线的拟合。在Teff = 15，000 K以上，这些理论不确定性最小的地方，选择了127颗DA星的样本。我们的分析结果表明，该分布的平均质量略低于以前的发现-接近0.53 M Ω。还发现了包含低质量和高质量物体的明显情况的延伸尾部。
Previous determinations of the mass distribution of DA white dwarfs are shown to be sensitive to both the input physics and the assumed atmospheric composition. A new mass distribution based on fitting observed hydrogen line profiles to theoretical model spectra is presented. A sample of 127 DA stars has been selected aboveTeff∼ 15,000 K where these theoretical uncertainties are minimal. The results of our analysis indicate that the mean mass of the distribution is somewhat lower — near 0.53M⊙— than found previously. Extended tails which contain clear cases of low and high mass objects are also found.