Multi-wavelength observations of Proxima Centauri

Multi-wavelength observations of Proxima Centauri
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比邻星的多波长观测

DOI:
10.1051/0004-6361/201117447
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发表时间:
2011
影响因子:
6.5
通讯作者:
J. H. M. M
J. H. M. M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Fuhrmeister;Lalitha;Poppenhaeger;Rudolf;Liefke;Reiners;Schmitt;J. H. M. M

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我们报告了2009年3月用VLT/UVES和xmm -牛顿望远镜在三个晚上同时观测到邻近的耀斑恒星比邻星。我们的光学和x射线观测覆盖了恒星的静止状态,以及它的耀斑活动,使我们能够探测恒星大气条件,从光球层到色球层,然后是不同活动阶段的日冕。方法利用x射线数据,研究了日冕密度和丰度的变化,并推断了中等大小耀斑的环特性。利用光学数据研究了比邻星的磁场及其可能的变异性,构建了色球的发射谱线表,并利用某些发射谱线构建了比邻星色球的物理模型。结果我们报告了在比邻星较活跃的状态下,在3388 Å发现了一个弱光学禁铁线。对于中间耀斑,我们发现了两个可能起源于相邻环路的二次耀斑事件,并讨论了在此耀斑期间在hi, He i和Ca ii线上观察到的线不对称性。h α线的高时间分辨率突出了观测到的线不对称性的强烈时间变化,这种不对称性在二次耀斑事件中再次出现。我们还提出了用恒星大气代码PHOENIX构建耀斑色球模型的理论模型。
AimsWe report simultaneous observations of the nearby flare star Proxima Centauri with VLT/UVES andXMM-Newtonover three nights in March 2009. Our optical and X-ray observations cover the star’s quiescent state, as well as its flaring activity and allow us to probe the stellar atmospheric conditions from the photosphere into the chromosphere, and then the corona during its different activity stages.MethodsUsing the X-ray data, we investigate variations in coronal densities and abundances and infer loop properties for an intermediate-sized flare. The optical data are used to investigate the magnetic field and its possible variability, to construct an emission line list for the chromosphere, and use certain emission lines to construct physical models of Proxima Centauri’s chromosphere.ResultsWe report the discovery of a weak optical forbidden Fe xiii line at 3388 Å  during the more active states of Proxima Centauri. For the intermediate flare, we find two secondary flare events that may originate in neighbouring loops, and discuss the line asymmetries observed during this flare in H i, He i, and Ca ii lines. The high time-resolution in the Hαline highlights strong temporal variations in the observed line asymmetries, which re-appear during a secondary flare event. We also present theoretical modelling with the stellar atmosphere code PHOENIX to construct flaring chromospheric models.
M 矮星比邻星中心的多色测光。
DOI: 10.1086/129334
发表时间: 1972
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