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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/76684

    Title: The destiny of a binary system under different mass loss scenarios
    Authors: 馮思賢;Feng, Xi-Sian
    Contributors: 天文研究所
    Keywords: 雙星系統;質量流失;分子雲
    Date: 2018-07-23
    Issue Date: 2018-08-31 11:33:14 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 我們研究雙星系統有不同方式質量流失的動力學,對於當質量流失完之後,這個系
    二種是雙星系統在分子雲 (或雲核) 裡而分子雲 (或雲核) 會隨著時間擴張或質量流

    對於只考慮雙星系統的例子,我們考慮三種不同的系統:(1) 主星質量遠大於伴
    星,然後研究質量流失分別是 (a) 主星流失 (b) 伴星流失,(2) 兩顆雙星質量一
    樣,其中一顆星流失 (3) 兩顆星總質量不變,其中一顆星的質量吸積到另一顆星

    對於分子雲裡的雙星系統,我們提出兩種模型去描述雲 (或雲核) 的擴散。我
    自由間轉換。;We study the dynamics of a binary system under different mass loss scenarios. We
    are particularly interested in the conditions under which the system remains bound
    or not when the mass loss process is stopped. We study two cases. The first one is
    the binary system is an isolated system and one of the stars change its mass for a
    finite time. The second one is the binary system is embedded in molecular cloud (or
    cloud core) and the cloud (or cloud core) is dispersing or losing mass.

    For the isolated binary system, we consider three different systems. (1) The host
    star is much heavier than the companion star, and we study mass loss by (a) host
    star (b) companion star. (2) Both stars has similar mass, and mass loss by one star
    (3) the total mass is unchanged, mass transfer from one star to the other. Most of
    them have similar results. For example, the system is more likely to be unbound
    if the mass loss is large. Also there is a general trend that for a fix mass loss, the
    longer is the time interval of mass loss, the more likely is the system remains bound.
    However, this trend is not necessary monotonic. It may happen that the system may
    alternate between bound and unbound destiny when the time interval of mass loss
    increases within a certain range.

    For embedded the binary system, we propose two models for cloud dispersion. We
    find that the binary system is more likely to be unbound if the initial position is
    larger, or initial velocity is faster, or the mass of cloud is larger. The dependence of
    dispersion time is complicated. When the density of interstellar medium is small, the
    time of dispersion has a great impact on system. When the density of interstellar
    medium is large, the increase in dispersion time may cause the system to alternate
    between bound and unbound destiny
    Appears in Collections:[天文研究所] 博碩士論文

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