• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >A DUSTY DISK AROUND WD 1150-153: EXPLAINING THE METALS IN WHITE DWARFS BY ACCRETION FROM THE INTERSTELLAR MEDIUM VERSUS DEBRIS DISKS
【24h】

A DUSTY DISK AROUND WD 1150-153: EXPLAINING THE METALS IN WHITE DWARFS BY ACCRETION FROM THE INTERSTELLAR MEDIUM VERSUS DEBRIS DISKS

机译：WD 1150-153周围的尘埃盘：通过星际介质对碎片盘的吸积来解释白矮星中的金属

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We report the discovery of excess K-band radiation from a metal-rich DAV white dwarf star, WD 1150-153. Our near-infrared spectroscopic observations show that the excess radiation cannot be explained by a (sub)stellar companion, and is likely to be caused by a debris disk similar to the other DAZ white dwarfs with circumstellar debris disks. We find that the fraction of DAZ white dwarfs with detectable debris disks is at least 14%. We also revisit the problem of explaining the metals in white dwarf photospheres by accretion from the interstellar medium (ISM). We use the observed interstellar column densities toward stars in close angular proximity and similar distance as DAZ white dwarfs to constrain the contribution of accretion from the ISM. We find no correlation between the accretion density required to supply metals observed in DAZs with the densities observed in their interstellar environment, indicating that ISM accretion alone cannot explain the presence of metals in nearby DAZ white dwarfs. Although ISM accretion will certainly contribute, our analysis indicates that it is not the dominant source of metals for most DAZ white dwarfs. Instead, the growing number of circumstellar debris disks around DAZs suggests that circumstellar material may play a more dominant role in polluting the white dwarf atmospheres.
机译：我们报道了从富含金属的DAV白矮星WD 1150-153发现过量的K波段辐射的情况。我们的近红外光谱观察表明，多余的辐射无法由（亚）星状伴星解释，并且可能是由与其他带有圆星状碎片盘的DAZ白矮星类似的碎片盘引起的。我们发现带有可检测碎片盘的DAZ白矮星的比例至少为14％。我们还回顾了通过星际介质（ISM）的积聚解释白矮星光球中金属的问题。我们使用观测到的星际列密度接近与DAZ白矮星接近的角且距离与DAZ白矮星相近的恒星，以限制ISM积聚的贡献。我们发现，提供DAZ中观察到的金属所需的累积密度与在星际环境中观察到的密度之间没有相关性，这表明仅ISM累积无法解释附近DAZ白矮星中金属的存在。尽管ISM的增加肯定会有所贡献，但我们的分析表明，它不是大多数DAZ白矮星的主要金属来源。取而代之的是，DAZ周围的星际碎片盘越来越多，这表明，在污染白矮星大气中，星际物质可能起着更主要的作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号