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首页> 外文期刊>The Astrophysical journal >A REMNANT DISK AROUND A YOUNG MASSIVE STAR
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A REMNANT DISK AROUND A YOUNG MASSIVE STAR

机译：一颗巨大恒星周围的残骸

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While the formation of low-mass stars has become a well-studied process, it is still difficult to verify a similar evolutionary sequence for massive stars. Although several young stages from massive starless cores to massive protostellar candidates with jets and outflows have been observed, massive star/disk systems whose properties can be inferred uniquely are rare. The final stage of this sequence, i.e., a newborn massive star that is still surrounded by a remnant disk, is missing. This is probably a consequence of the rapid evolution of these systems and the early destruction of the disk in the vicinity of a massive star. We report on an optically visible young massive star (IRS 15) within M17 that displays a huge IR excess. This fortunate coincidence offers the rare opportunity to investigate the star as well as its circumstellar environment in great detail. We have performed both optical and infrared photometry and spectroscopy of the stellar source; in addition, its circumstellar environment has been investigated by mid-infrared imaging. Our data suggest that IRS 15 is a star of about 26 solar mass surrounded by a huge remnant disk of about half a Jupiter mass of dust. From this, we corroborate that massive stars can form by disk accretion and conclude that also their circumstellar disks evolve like those of low-mass stars.
机译：虽然低质量恒星的形成已成为一个经过充分研究的过程，但仍然难以验证大质量恒星的类似演化序列。尽管已经观察到了几个年轻的阶段，从无恒星的核心到具有喷射和流出的巨大的原恒星候选，但是罕见的可以独特地推断其性质的巨大恒星/磁盘系统很少见。该序列的最后阶段，即仍被残余圆盘围绕的新生大质量恒星丢失了。这可能是这些系统的快速发展以及大质量恒星附近磁盘的早期破坏的结果。我们报告了M17内的一颗光学可见的年轻大质量恒星（IRS 15），它显示出巨大的IR过量。这种幸运的巧合提供了难得的机会来详细研究恒星及其星际环境。我们已经对恒星源进行了光学和红外光度法和光谱学分析；此外，还通过中红外成像研究了其星际环境。我们的数据表明，IRS 15是一颗约26太阳质量的恒星，周围环绕着一块约有木星质量的一半尘埃的巨大剩余圆盘。据此，我们证实了大质量恒星可以通过盘状吸积形成，并得出结论，其恒星盘也像低质量恒星一样演化。

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