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    National Tsing Hua University Institutional Repository > 歷任校長 > 徐遐生 (2002-2006) > 期刊論文 >  SELF-SIMILAR COLLAPSE OF ISOTHERMAL SPHERES AND STAR FORMATION


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81025


    Title: SELF-SIMILAR COLLAPSE OF ISOTHERMAL SPHERES AND STAR FORMATION
    Authors: SHU, F.H.
    教師: 徐遐生
    Date: 1977
    Publisher: American Astronomical Society
    Relation: ASTROPHYSICAL JOURNAL, American Astronomical Society, Volume 214, Issue 2, 1977, Pages 488-497
    Keywords: DENSITY DISTRIBUTION
    GRAVITATIONAL COLLAPSE
    ISOTHERMAL FLOW
    PROTOSTARS
    STAR FORMATION
    STELLAR STRUCTURE
    CRITICAL POINT
    RUNGE-KUTTA METHOD
    SIMILARITY THEOREM
    STEADY STATE
    STELLAR ENVELOPES
    Abstract: Similarity solutions are obtained which describe the gravitational collapse of isothermal spheres that originated as gas clouds not far removed from the condition of marginal stability. It is argued that the similarity solution of Larson and Penston (1969) for the stages before core formation is physically artificial, but the gasdynamic flow subsequent to core formation exhibits self-similar properties. Similarity solutions are determined for the collapse of singular isothermal spheres, minus solutions without critical points are obtained by imposing the condition that the fluid velocities are negligible at the 'initial instant', and an expansion-wave collapse solution is evaluated. The results are illustrated with a numerical example roughly corresponding to conditions appropriate for Bok globules or the central regions of a nonmagnetic molecular cloud. Two possible applications of the solutions are discussed: analyzing the stability to gravitational fragmentation of collapsing pressure-free gas spheres and determining the amount of energy radiated away during protostar formation.
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    Relation Link: http://aas.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81025
    Appears in Collections:[ 徐遐生 (2002-2006)] 期刊論文
    [物理系] 期刊論文

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