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首页> 外文期刊>The Astrophysical journal >DISCOVERY OF PHOTOSPHERIC GERMANIUM IN HOT DA WHITE DWARFS
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DISCOVERY OF PHOTOSPHERIC GERMANIUM IN HOT DA WHITE DWARFS

机译:热大白矮星中光球锗的发现

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摘要

We report the identification of Ge IV resonance lines in ultraviolet spectra of the hot DA white dwarfs Feige 24, G191-B2B, and GD 246. The lines originate in the stellar photosphere, and we measure low Ge/H abundance ratios ranging between -8.0 and -8.7. We also tentatively identify a resonance line of Sn IV blended with an Fe v line in the spectrum of G191-B2B. The presence of germanium extends our knowledge of the abundance pattern in hot white dwarfs beyond the iron group. The abundance ratio appears nearly solar, which implies either that the germanium abundance mixture in these stars has remained unaltered since leaving the main sequence or that diffusion processes (e.g., selective radiation pressure) are coincidentally reproducing a solar Ge/H ratio.
机译:我们报告了高温DA白矮星Feige 24,G191-B2B和GD 246在紫外光谱中的Ge IV共振线的鉴定。这些线起源于恒星​​光球,我们测量的低Ge / H丰度比在-8.0之间和-8.7。我们还初步确定了G191-B2B光谱中掺有Fe v线的Sn IV共振线。锗的存在扩展了我们对铁白矮星中热白矮星中丰度模式的认识。丰度比几乎接近太阳,这意味着这些星中的锗丰度混合物自离开主序以来一直保持不变,或者扩散过程(例如选择性辐射压力)恰好重现了太阳Ge / H比。

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