物理化学模型：来源定制还是通用？
Physicochemical models: source-tailored or generic?
摘要：
物理化学模型可以成为追踪原恒星系统化学演化的有力工具，并可以限制其形成时的物理条件。这项工作的目的是评估是否需要源定制的建模来解释年轻的低质量原恒星周围观察到的分子丰度，或者是否以及在多大程度上，通用模型可以提高我们对恒星形成最早阶段化学的理解。比较了三种模型的物理条件和最简单、最丰富分子的丰度。在确定计算的化学输出之间的差异之后，对于所有三组物理输入参数，用相同的化学模型重新进行计算。在消除化学模型差异的基础上，根据物理模型的影响对输出进行比较。结果表明，与物理条件的影响相比，化学模型的影响很小，考虑的时间尺度具有最剧烈的影响。源量身定制的模型在设计上可能更简单;然而，可能不足以限制恒星形成区域的全球图片内的物理和化学参数。具有更全面物理学的通用模型可能无法提供与特定原恒星系统观测的最佳匹配，但允许从其他恒星形成区域的角度研究源。
英文摘要：
Physicochemical models can be powerful tools to trace the chemical evolution of a protostellar system and allow to constrain its physical conditions at formation. The aim of this work is to assess whether source-tailored modelling is needed to explain the observed molecular abundances around young, low-mass protostars or if, and to what extent, generic models can improve our understanding of the chemistry in the earliest stages of star formation. The physical conditions and the abundances of simple, most abundant molecules based on three models are compared. After establishing the discrepancies between the calculated chemical output, the calculations are redone with the same chemical model for all three sets of physical input parameters. With the differences arising from the chemical models eliminated, the output is compared based on the influence of the physical model. Results suggest that the impact of the chemical model is small compared to the influence of the physical conditions, with considered timescales having the most drastic effect. Source-tailored models may be simpler by design; however, likely do not sufficiently constrain the physical and chemical parameters within the global picture of star-forming regions. Generic models with more comprehensive physics may not provide the optimal match to observations of a particular protostellar system, but allow a source to be studied in perspective of other star-forming regions.
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