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The mystery companion

机译:神秘伴侣

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摘要

A jet-like flow of material, detected in the vicinity of a dying star, supports a model in which such jets shape the gas cloud around the star into a bipolar nebula. The jet probably comes from an unseen companion star. As Sun-like stars exhaust the nuclear fuel in their cores, they become 'red giants', swelling to a size several hundred times that of the Sun. The stars begin to lose mass, emitting a dense wind of gas that, in most red giants, would be expected to be spherically symmetric. Using the Hubble Space Telescope, Sahai et al. have discovered a fast wind emanating from the vicinity of a red giant that is collimated, rather than spherical (page 261 of this issue). This, coupled with similar observations of another dying star, suggests why the gas clouds that form around many red giants―known as planetary nebulae―are elongated, or bipolar. But this latest detection, around the star V Hydrae as it begins its transition to a planetary nebula, also points more clearly to the origin of the cloud-shaping jets.
机译:在垂死的恒星附近检测到的类似喷射流的物质流支持一种模型,在这种模型中,这种喷射流将恒星周围的气体云整形为双极星云。喷气机可能来自一个看不见的同伴星。当类似太阳的恒星耗尽其核中的核燃料时,它们变成“红色巨人”,膨胀到太阳的数百倍。恒星开始失去质量,散发出浓密的气体风,在大多数红色巨星中,它们被期望是球对称的。 Sahai等使用哈勃太空望远镜。我们发现了一条来自准直而不是球形的红色巨人附近的快速风(本期第261页)。这再加上对另一颗垂死恒星的类似观测结果,说明了为什么在许多红色巨人(称为行星状星云)周围形成的气体云是拉长的或双极的。但是,在恒星V Hydrae开始过渡到行星状星云时,这一最新发现也更清楚地指出了云状喷射流的起源。

著录项

  • 来源
    《Nature》 |2003年第6964期|p.236-237|共2页
  • 作者

    Noam Soker;

  • 作者单位

    Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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