Molecular evolution in star-forming cores: From prestellar cores to protostellar cores
نویسندگان
چکیده
منابع مشابه
Molecular evolution in star-forming cores: From prestellar cores to protostellar cores
We investigate the molecular abundances in protostellar cores by solving the gasgrain chemical reaction network. As a physical model of the core, we adopt a result of onedimensional radiation-hydrodynamics calculation, which follows the contraction of an initially hydrostatic prestellar core to form a protostellar core. Temporal variation of molecular abundances is solved in multiple infalling ...
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We investigate molecular evolution in a star-forming core that is initially a hydrostatic starless core and collapses to form a low-mass protostar. The results of a one-dimensional radiation-hydrodynamics calculation are adopted as a physical model of the core. We first derive radii at which CO and large organic species sublimate. CO sublimation in the central region starts shortly before the f...
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We have investigated the evolution and distribution of molecules in collapsing prestellar cores via numerical chemical models, adopting the Larson-Penston solution and its delayed analogues to study collapse. Molecular abundances and distributions in a collapsing core are determined by the balance among the dynamical, chemical and adsorption time scales. When the central density nH of a prestel...
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Context. Dense molecular cores are studied in order to gain insight into the processes causing clouds to fragment and form stars. In this study we concentrate on a region which is assumed to represent an early stage of clustered star formation in a giant molecular cloud. Aims. The aims of this study are to determine the properties and spatial distribution of dense cores in the relatively quiesc...
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Improving our understanding of the initial conditions and earliest stages of star formation is crucial to gain insight into the origin of stellar masses, multiple systems, and protoplanetary disks. We review the properties of low-mass dense cores as derived from recent millimeter/submillimeter observations of nearby molecular clouds and discuss them in the context of various contemporary scenar...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2008
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921308021364