星系盘近期恒星形成过程中氘吸光的关闭
Turn-off of Deuterium Astration in the Recent Star Formation of the Galaxy Disk
摘要：
当地恒星盘的化学特征已经确定，长期，连续的恒星形成一直伴随着稳定的低金属气体从晕吸积率。我们现在认为，最近在银河系中发现的增强的氘（D）分数与这张照片是一致的。我们考虑两个过程：D在恒星内部的毁灭（天体毁灭）和与气体下降有关的几乎原始的D的供应。传统的银河系化学演化模型预测D/H随时间单调下降，目前的D/H丰度远低于最近发现的本地值。这一预测的特征是高水平的氘原子吸收参与形成的局部金属增强盘的结果。在这里，我们提出了一个新的通道来解释所观察到的D/H增强。我们的模型调用了持续的气态下沉和在过去几个回转中下降的恒星形成率，预测在相同的时间间隔内，天球会被抑制。
英文摘要：
Chemical features of the local stellar disk have firmly established that long-term, continuous star formation has been accompanied by a steady rate of accretion of low-metallicity gas from the halo. We now argue that the recent discovery of an enhanced deuterium (D) fraction in the Galaxy is consistent with this picture. We consider two processes: the destruction of D in the interior of stars (astration) and the supply of nearly primordial D associated with the gas infall. Conventional Galactic chemical evolution models predict a monotonic decrease in D/H with time with a present-day D/H abundance which is much lower than the local value recently revealed. This predicted feature is the result of high levels of deuterium astration involved in the formation of the local metal-enhanced disk. Here we propose a new channel to explain the observed enhancement in D/H. Our model, which invokes ongoing gaseous infall and a star formation rate that declines over the past several Gyr, predicts that the D astration is suppressed over the same time interval.
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