...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Astronomy and astrophysics >Accretion dynamics and disk evolution in NGC?2264: a study based on CoRoT photometric observations
【24h】

Accretion dynamics and disk evolution in NGC?2264: a study based on CoRoT photometric observations

机译：NGC？2264中的吸积动力学和磁盘演化：基于CoRoT光度观测的研究

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Context. The young cluster NGC2264 was observed withthe CoRoT satellite for 23days uninterruptedly in March 2008 withunprecedented photometric accuracy. We present the first results of ouranalysis of the accreting population belonging to the cluster asobserved by CoRoT. Aims. We search for possible light curve variability of the samenature as that observed in the classical TTauri star AATau,which was attributed to a magnetically controlled inner disk warp. Theinner warp dynamics is supposed to be directly associated with theinteraction between the stellar magnetic field and the inner diskregion. Methods. We analyzed the CoRoT light curves of83previously known classical TTauri stars that belong toNGC2264 classifying them according to their light-curvemorphology. We also studied the CoRoT light-curve morphology as afunction of a Spitzer-based classification of the star-disk systems. Results. The classification derived on the basis of the CoRoT light-curve morphology agrees very well with the SpitzerIRAC-based classification of the systems. The percentage of AA Tau-likelight curves decreases as the inner disk dissipates, from 40%10% in systems with thick inner disks to 36%16% in systems with anemic disks and zero in naked photosphere systems. Indeed, 91%29% of the CTTS with naked photospheres exhibit pure spot-like variability, while only 18%7% of the thick disk systems do so, presumably those seen at low inclination and thus free of variable obscuration. Conclusions. AA Tau-like light curves are found to be fairly common, with a frequency of at least 30to40% in young stars with inner dusty disks. The temporalevolution of the light curves indicates that the structure of the innerdisk warp, located close to the corotation radius and responsible forthe obscuration episodes, varies over a timescale of a few (1-3) rotational periods. This probably reflects the highly dynamical nature of the star-disk magnetospheric interaction. Key words: accretion, accretion disks - techniques: photometric - stars: pre-main sequence
机译：上下文。在2008年3月用CoRoT卫星连续23天观测到了年轻的NGC2264星团，其光度测量精度达到了前所未有的水平。我们介绍了我们分析CoRoT观察到的属于该群的吸积人口的初步结果。目的我们搜索与经典TTauri恒星AATau中观察到的相同性质的可能的光曲线变异性，这归因于磁控内盘翘曲。内部翘曲动力学被认为直接与恒星磁场和内部磁盘区域之间的相互作用有关。方法。我们分析了属于NGC2264的83个先前已知的经典TTauri星的CoRoT光曲线，并根据它们的光曲线形态对其进行了分类。我们还研究了CoRoT光曲线形态与星盘系统基于Spitzer分类的功能。结果。基于CoRoT光曲线形态的分类与基于SpitzerIRAC的系统分类非常吻合。内圆盘消散时，AA Tau样光曲线的百分比降低，从内圆盘较厚的系统中的40％10％降低到无氧圆盘系统的36％16％，裸光球系统中的零。实际上，有裸露的光球的CTTS中有91％29％表现出纯的斑点状变化，而厚盘系统只有18％7％表现出这种变化，大概是那些以低倾斜度观察到的，因此没有明显的模糊。结论。发现类似AA Tau的光曲线非常普遍，在带有内部尘埃盘的年轻恒星中，频率至少为30％至40％。光曲线的时间演化表明，内圆盘翘曲的结构位于同旋转半径附近，是造成遮盖现象的原因，它在几个（1-3）旋转周期的时间范围内变化。这可能反映了星盘磁层相互作用的高度动力学性质。关键词：吸积吸积盘-技术：光度法-星星：主序前

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