Warm cores around regions of low-mass star formation Warm cores around regions of low-mass star formation
Warm cores around regions of low-mass star formation Warm cores around regions of low-mass star formation
复制标题
低质量恒星形成区域周围的暖核 低质量恒星形成区域周围的暖核
DOI：
10.1111/j.1365-2966.2010.17077.x
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发表时间：
2010
影响因子：
4.8
通讯作者：
Awad Z
中科院分区：
文献类型：
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作者：
Awad Z
低质量原恒星周围的温暖核心（或热corino）显示出丰富的化学物质，具有强烈的空间变化。这种化学反应通常归因于恒星辐射的变暖效应引发的尘埃颗粒上的冰幔升华。我们已经使用了一个模型的化学在温暖的核心，其中的升华过程是基于广泛的实验室数据，这些数据表明，从混合冰升华发生在几个明确定义的温度带。我们已经确定了太阳质量星星缓慢变暖时这些带的位置。由此产生的化学主要是由升华过程和随后的气相反应;强烈的空间和时间变化，在某些分子物种被发现发生，我们的结果是，在一般情况下，与观测结果的充分研究源IRAS 16293-2422一致。所用的模型与描述热核化学性质的模型相似。我们推断，热核和暖核的化学性质可以用相同的模型来描述（根据不同的物理参数进行适当的调整）。
Warm cores (or hot corinos) around low-mass protostellar objects show a rich chemistry with strong spatial variations. This chemistry is generally attributed to the sublimation of icy mantles on dust grains initiated by the warming effect of the stellar radiation. We have used a model of the chemistry in warm cores in which the sublimation process is based on extensive laboratory data; these data indicate that sublimation from mixed ices occurs in several well-defined temperature bands. We have determined the position of these bands for the slow warming by a solar-mass star. The resulting chemistry is dominated by the sublimation process and by subsequent gas-phase reactions; strong spatial and temporal variations in certain molecular species are found to occur, and our results are, in general, consistent with observational results for the well-studied source IRAS 16293–2422. The model used is similar to the one that describes the chemistry of hot cores. We infer that the chemistry of both hot cores and warm cores may be described by the same model (suitably adjusted for different physical parameters).