• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >SMOKE SIGNALS FROM IRC+102l6. I. MILLIARCSECOND PROPER MOTIONS OF THE DUST
【24h】

SMOKE SIGNALS FROM IRC+102l6. I. MILLIARCSECOND PROPER MOTIONS OF THE DUST

机译：从IRC + 102l6吸烟信号。 I.灰尘的第二次适当运动

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

The results of a seven epoch interferometric imaging study, at wavelengths in the near-infrared K band, of the carbon star IRC+ l02l6 are presented. The use of non- and partially redundant aperture masking techniques on the 10 m Keck I telescope has allowed us to produce images of the innermost regions of the circumstellar dust envelope with unprecedented detail. With roughly twice the resolving power of previous work, the complex asymmetric structures reported within the central 0"5 (~20 R*) have been imaged at the size scale of the stellar disk itself (~ 50 mas). A prominent dark lane at a posi- tion angle of approximately l20" is suggested to be an optically thick disk or torus of dust which could help to explain IRC+ 102l6's well-known bipolarity at a position angle of ~20'. Observations spanning more than a pulsational cycle (~638 days) have revealed significant temporal evolution of the nebula, including the outward motion of bright knots and clumps. Registering these displacements against the compact bright core, which we tentatively identify as marking the location of the star, has allowed us to determine the apparent angular velocity at a number of points. The magnitudes of the proper motions were found to be in agreement with current estimates of the stellar distance and radial velocity. Higher outflow speeds were found for features with greater separation from the core. This is consistent with acceleration taking place over the region sampled by the measurements, however, alternate interpreta- tions are also presented. Although a number of changes of morphology were found, none were clearly interpreted as the condensation of new dust over the pulsation cycle. Unfortunately, ambiguities associ- ated with the true three-dimensional nature of the nebula weaken a number of our quantitative and qualitative conclusions.
机译：给出了碳星IRC + 102l6在近红外K波段波长下七次干涉成像研究的结果。在10 m Keck I望远镜上使用非冗余和部分冗余的光圈掩盖技术，使我们能够以前所未有的细节产生绕星尘包膜最内部区域的图像。在大约两倍于以前工作的分辨力的情况下，中心星号0“ 5（〜20 R *）内报告的复杂非对称结构已经以恒星盘本身的大小尺度（〜50 mas）成像。建议将约120“的位置角定为光学上较厚的圆盘或灰尘圆环，这可能有助于解释IRC + 102l6在〜20'的位置角处众所周知的双极性。跨越超过一个脉动周期（〜638天）的观测发现，星云出现了明显的时间演变，包括明亮的结和团块的向外运动。将这些位移记录在紧凑的明亮核上，我们暂时将其识别为标记恒星的位置，这使我们能够确定许多点的视在角速度。发现适当运动的幅度与当前对恒星距离和径向速度的估计一致。发现与芯分离距离更大的特征具有更高的流出速度。这与在通过测量采样的区域上发生的加速度是一致的，但是，还提供了其他解释。尽管发现了许多形态变化，但没有一个被清楚地解释为新的尘埃在脉动周期中的凝结。不幸的是，与星云真正的三维性质相关的歧义削弱了我们的定量和定性结论。

著录项

相似文献

  • 外文文献
  • 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