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首页> 外文期刊>The Astrophysical journal >THE OXYGEN ABUNDANCE OF HE 1327-2326
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THE OXYGEN ABUNDANCE OF HE 1327-2326

机译：他1327-2326的氧丰度

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摘要

From a newly obtained VLT/UVES spectrum, we have determined the oxygen abundance of HE 1327 - 2326, the most iron-poor star known to date. Ultraviolet OH lines yield one-dimensional LTE abundances of [O/Fe]_(OH) = 3.7 (subgiant case) and [O/Fe]_(OH) = 3.4 (dwarf case). Using a correction of -1.0 dex to account for three-dimensional (3D) effects on OH line formation, the abundances are lowered to [O/Fe] = 2.8 and [O/Fe] = 2.5, respectively, which we adopt. Without 3D corrections, the UV OH-based abundance would be in disagreement with the upper limits derived from the O Ⅰ triplet lines: [O/Fe]_(trip) < 2.8 (subgiant) and [O/Fe]_(trip) < 3.0 (dwarf). We also correct the previously determined carbon and nitrogen abundances for 3D effects. Knowledge of the O abundance of HE 1327-2326 has implications for the interpretation of its abundance pattern. A large O abundance is in accordance with HE 1327-2326 being an early Population Ⅱ star that formed from material chemically enriched by a first-generation supernova. Our derived abundances, however, do not exclude other possibilities such as a Population Ⅲ scenario.
机译：根据最新获得的VLT / UVES光谱，我们确定了HE 1327-2326的氧丰度，HE 1327-2326是迄今为止已知的最铁贫乏的恒星。紫外线OH线产生[O / Fe] _（OH）= 3.7（次要情况）和[O / Fe] _（OH）= 3.4（矮情况）的一维LTE丰度。使用-1.0 dex的校正来解决对OH线形成的三维（3D）影响，将丰度分别降低到我们采用的[O / Fe] = 2.8和[O / Fe] = 2.5。如果不进行3D校正，基于UV OH的丰度将与从OⅠ三重态谱线得出的上限不一致：[O / Fe] _（trip）<2.8（subgiant）和[O / Fe] _（trip） <3.0（矮人）。我们还纠正了先前确定的3D效果碳和氮丰度。关于HE 1327-2326的丰度的知识对其丰度模式的解释具有影响。根据HE 1327-2326，它是大的O丰度，它是由第一代超新星化学富集的物质形成的早期人口Ⅱ星。但是，我们得出的数量并不排除其他可能性，例如人口Ⅲ情景。

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