罗萨特X射线探测到了一个年轻的棕色矮星,它位于黑色云层中
1R. Neuhauser, Max-Planck-Institut fur Extraterrestrische Physik, D-85740 Garching, Germany. E-mail: rne@mpe.mpg.de F. Comeron, European Southern Observatory, D-85748 Garching, Germany.
Science (New York, N.Y.)
|October 2, 1998
概括
从年轻的棕矮星Cha Halpha 1中检测到的X射线辐射表明磁性活动. 这一发现为棕矮星在恒星形成区域的行为提供了见解.
科学领域:
- 天文学和天体物理学
- 恒星进化 恒星进化
- 太阳系外行星研究
背景情况:
- 棕矮星是星下物体,其质量不足以维持核聚变.
- 香龙I恒星形成云是一个附近的区域,以年轻的恒星物体而闻名.
- 晚期M型恒星呈现X射线辐射,通常与磁性活动有关.
研究的目的:
- 描述一个年轻的棕矮星Cha Halpha 1.
- 调查Cha Halpha 1的X射线辐射的存在和性质.
- 为了探索棕矮星中潜在的磁活动.
主要方法:
- 测光仪和光谱仪被用来确定物体的属性.
- 使用Rontgen卫星 (ROSAT) 进行了X射线观测.
- 对X射线光子进行分析,以计算光度和光度比.
主要成果:
- 查哈尔法1号被确定为一个大约106岁的棕矮星 (光谱类型M7.5-M8,0.04太阳质量).
- 静静的X射线发射被检测到具有9西格玛的意义.
- 计算的X射线亮度 (2.57 x 10^28 ergs/sec) 和X射线与博洛米度亮度比 (10^-3.44) 是晚期M型恒星的典型特征.
结论:
- 从Cha Halpha 1检测到的X射线辐射与磁性活动是一致的.
- 棕矮星,类似于对流晚型恒星,可能表现出磁性活动.
- 这项研究有助于了解年轻棕矮星中发生的物理过程.
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