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Two distinct sequences of blue straggler stars in the globular cluster M 30

机译:球状星团M 30中两个蓝色散乱星的不同序列

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摘要

Stars in globular clusters are generally believed to have all formed at the same time, early in the Galaxy's history. 'Blue stragglers' are stars massive enough that they should have evolved into white dwarfs long ago. Two possible mechanisms have been proposed for their formation: mass transfer between binary companions and stellar mergers resulting from direct collisions between two stars. Recently the binary explanation was claimed to be dominant. Here we report that there are two distinct parallel sequences of blue stragglers in M 30. This globular cluster is thought to have undergone 'core collapse', during which both the collision rate and the mass transfer activity in binary systems would have been enhanced. We suggest that the two observed sequences are a consequence of cluster core collapse, with the bluer population arising from direct stellar collisions and the redder one arising from the evolution of close binaries that are probably still experiencing an active phase of mass transfer.
机译:一般认为,球状星团中的恒星是在银河历史的早期同时形成的。 “蓝散流星”是足够大的恒星,以至于它们早就应该演化成白矮星。已经提出了两种可能的形成机制:双星同伴之间的质量转移和两颗恒星之间直接碰撞产生的恒星合并。最近,二进制解释据称占主导地位。在这里,我们报告说在M 30中有两个不同的蓝色散乱者平行序列。这个球状星团被认为经历了“核崩塌”,在此期间,碰撞速率和二元体系中的传质活性都将得到增强。我们认为,这两个观察到的序列是簇状核坍塌的结果,蓝色的种群是由直接的恒星碰撞引起的,红色的种群是由于紧密的二元分子的演化而产生的,而二元分子可能仍处于传质的活跃期。

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  • 来源
    《Nature》 |2009年第7276期|1028-1031|共4页
  • 作者单位

    Department of Astronomy, University of Bologna, Via Ranzani 1, 40127 Bologna, Italy;

    ESA, Space Science Department, Keplerlaan 1, 2200 AG Noordwijk, Netherlands;

    Department of Astronomy, University of Bologna, Via Ranzani 1, 40127 Bologna, Italy;

    Department of Astronomy, University of Bologna, Via Ranzani 1, 40127 Bologna, Italy;

    McMaster University, Department of Physics and Astronomy, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada.;

    Astronomy Department, University of Virginia, PO Box 400325,Charlottesville, Virginia 22904, USA;

    INAF, Osservatorio Astronomico di Bologna, Via Ranzani 1,40127 Bologna, Italy;

    Research School of Astronomy and Astrophysics, Mt Stromlo Observatory, Weston Creek, Australian Capital Territory 2611, Australia;

    Department of Astronomy, University of Bologna, Via Ranzani 1, 40127 Bologna, Italy;

    Department of Astronomy, University of Bologna, Via Ranzani 1, 40127 Bologna, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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