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A collimated, high-speed outflow from the dying star V Hydrae

机译:垂死的恒星V Hydrae的准直高速流出

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摘要

Stars with masses in the range 1-8 solar masses (solar mass) live ordinary lives for ~10~9-10~(10) years, but die extraordinary deaths. First, during their death throes as asymptotic giant branch (AGB) stars they eject, over 10~4-10~5 years, half or more of their mass in slowly expanding, spherical winds, and then, in a short (a few 100-1,000 years) and poorly understood phase, they are transformed into aspherical planetary nebula. Recent studies support the idea that high-speed, jet-like flows play a crucial role in this transformation. Evidence for such outflows is indirect, however; this phase is so short that few nearby stars are likely to be caught in the act. Here we report the discovery of a newly launched, high-speed jet-like outflow in the nearby AGB star, V Hydrae. We have detected both proper motions and ongoing evolution in the jet. These results support a model in which the jet is driven by an accretion disk around an unseen, compact companion. We also find a central, dense equatorial disk-like structure which may enable and/or enhance the formation of the accretion disk.
机译:质量在1至8太阳质量(太阳质量)范围内的恒星的正常生活寿命为〜10〜9-10〜(10)年,但死于非同寻常的死亡。首先,在死亡期间,作为渐近巨型分支(AGB)的恒星在10〜4-10〜5年内喷出一半或更多的质量,在缓慢扩展的球形风中弹射,然后在短时间内(几百个) -1000年)和相差甚少的相位,它们被转换成非球面行星状星云。最近的研究支持这样的观点,即高速的喷射流在这种转变中起着至关重要的作用。但是,这种流出的证据是间接的;这个阶段太短,以至于几乎没有附近的恒星被卷入这场行动。在这里,我们报告在附近的AGB星V Hydrae中发现了一个新近发射的高速喷射状流出物。我们已经检测到喷气机的正常运动和持续发展。这些结果支持了一种模型,在该模型中,射流由吸盘围绕着看不见的紧凑伴侣驱动。我们还发现了一种中央的,密集的,类似于赤道的盘状结构,可以使和/或增强吸积盘的形成。

著录项

  • 来源
    《Nature》 |2003年第6964期|p.261-264|共4页
  • 作者单位

    Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California 91109, USA;

  • 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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