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arXiv 1801.00201astro-ph.SRastro-ph.GA
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嵌入式原恒星的冷暖物理化学结构

The cold and warm physico-chemical structure of embedded protostars

Nadia M. Murillo

备注：
4 pages, 1 figure. In the proceedings of IAU Symposium No. 322: Astrochemistry VII - Through the cosmos from Galaxies to Planets
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摘要：

低质量原恒星的物理演化是相对完善的，然而，有许多关于原恒星的化学结构的问题。在恒星形成的早期嵌入阶段产生的化学指纹可能会传递到恒星、行星和彗星形成的后期阶段。影响化学指纹的因素是值得研究的，并确定化学结构是从母云继承的还是恒星形成过程中物理过程的产物。这里简要介绍了追踪嵌入原恒星冷和热延伸结构的分子的观察和建模结果。研究了位于蛇夫座$ρ$的两个多原恒星系统IRAS 16293-2422和VLA 1623-2417。我们发现，原恒星的物理结构，即盘状结构、外流腔和不同的光度，是决定这些原恒星化学结构的重要因素。

英文摘要：

The physical evolution of low-mass protostars is relatively well-established, however, there are many open questions on the chemical structure of protostars. The chemical fingerprint generated in the early embedded phase of star formation may be transmitted to the later stages of star, planet and comet formation. The factors that influence the chemical fingerprint are then of interest to study, and determine whether the chemical structure is inherited from the parent cloud or product of the physical processes during star formation. Results of observations and modelling of molecules that trace the cold and warm extended structures of embedded protostars are briefly presented here. Two multiple protostellar systems are studied, IRAS 16293-2422 and VLA 1623-2417, both located in $ρ$ Ophiuchus. We find that the physical structure of the protostars, that is the disk(-like) strucutres, outflow cavity and different luminosities, are important factors in determining the chemical structure of these embedded protostars.

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