• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Infrared spectrum of an extremely cool white-dwarf star
【24h】

Infrared spectrum of an extremely cool white-dwarf star

机译：极冷的白矮星的红外光谱

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

White dwarfs are the remnant cores of stars that initially had masses of less than 8 solar masses. They cool gradually over billions of years, and have been suggested to make up much of the 'dark matter' in the halo of the Milky Way. But extremely cool white dwarfs have proved difficult to detect, owing to both their faintness and their anticipated similarity in colour to other classes of dwarf stars. Recent improved models indicate that white dwarfs are much more blue than previously supposed, suggesting that the earlier searches may have been looking for the wrong kinds of objects. Here we report an infrared spectrum of an extremely cool white dwarf that is consistent with the new models. We determine the star's temperature to be 3,500 ± 200 K, making it the coolest known white dwarf. The kinematics of this star indicate that it is in the halo of the Milky Way, and the density of such objects implied by the serendipitous discovery of this star is consistent with white dwarfs dominating the dark matter in the halo.
机译：白矮星是最初质量小于8太阳质量的恒星的残留核。它们在数十亿年的时间里逐渐冷却，并被建议在银河系的光环中弥补大部分“暗物质”。但是事实证明，极冷的白矮星由于其暗淡和与其他矮星的颜色相似而难以检测。最近改进的模型表明，白矮星比以前想象的要蓝得多，这表明较早的搜索可能一直在寻找错误种类的物体。在这里，我们报告了一个极冷的白矮星的红外光谱，该光谱与新模型一致。我们确定该恒星的温度为3500±200 K，使其成为已知最酷的白矮星。这颗恒星的运动学表明它位于银河系的光环中，这颗星的偶然发现所隐含的此类物体的密度与主导该光环暗物质的白矮星一致。

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