We show how the observed hydrogen Balmer and Lyman emission lines constrain the modeling of quiescent solar prominences. We compare space observations of Lyman lines with ground-based observations of Balmer lines for quiescent solar prominences of comparable brightness defined by their H-beta emission. The effective number densities of hydrogen atoms emitting from the same upper level u deduced from the corresponding emerging Lyman and Balmer line emissions show large differences that diminish with increasing level number and converge at the highest level numbers. Hydrogen atoms excited in u=5 contribute 250 times less, and those in u=8 still contribute 65 times less to the Lyman than to the corresponding Balmer emission, supporting the idea of distinct spatial origin of the emissions of both series. This is also indicated by the line widths. The high optical thickness of all Lyman members allows the brightness temperature T_b to be estimated from the spectral radiance at line center, where T_b is found to be largely independent of the upper level number, in contrast to the (known) behavior of the Balmer lines.
Update of the Solar Lyman-Alpha Profile Line Model
我们提出了一个太阳周期演变的太阳莱曼α线轮廓模型的修改,随着星际中性氢氢辐射压力水平的不确定性的敏感性研究。线轮廓模型最初由Kowalska-Leszczynska et al. 2018 a开发,由复合太阳莱曼α通量参数化,最近修订了Machol et al. 2019。我们提出了修改参数的太阳辐射压力的中性氢和氘原子在日光层的先前开发的模型。模型中使用的数学函数以及拟合程序保持不变。我们选择的ISN H属性在日光层的模型修改的影响,我们讨论了这些数量的敏感性的不确定性的复合莱曼-α系列的校准。
The spectroscopic evolution of the symbiotic star AG Draconis. I.The O VI Raman, Balmer, and helium emission line variations during the outburst of 2006-2008
AG Dra是一小群低金属量的S-型共生双星之一,它们与K-型巨星共生,偶尔会发生不明原因的短期爆发。我们的目的是利用红巨星风中的光学拉曼谱线和其他辐射特征来研究白矮星在爆发过程中的行为。我们的目标是确定在一个重大的爆发事件,并研究在一个重大的爆发过程中的紫外线和光学之间的耦合在这个系统中的增益的包络线和风的变化。利用中、高分辨率的地基光谱,并与档案资料中的$FUSE$和$HST/STIS$光谱进行对比,研究了2006年9月以来爆发期间OVI特征和Balmer、He I、He II谱线的演化。到2007年5月,并包括最近的观测(2009年),以研究源的后续演变。的O VI拉曼功能完全消失在高峰期的主要爆发和随后的变化与前十年的报告有很大不同。He I和He II线以及巴耳末线的相位随拉曼特征而变化,但在2006-2008年期间,He I 6678,7065相对于O VI拉曼6825的变化存在双重值,这在以前没有报道过。通过爆发间隔的拉曼特征比的变化是一致的O VI FUV共振风线从白矮星和周围的O $^{+5}$电离区域内的红巨星风引起的膨胀和冷却的白矮星光球的消失。
ExoplaNeT accRetion mOnitoring sPectroscopic surveY (ENTROPY) - II. Time series of Balmer line profiles of Delorme 1(AB)b
Université Grenoble Alpes(格勒诺布尔阿尔卑斯大学);CNRS(法国国家科学研究中心);IPAG(天体物理学与行星学研究所);Institutionen för astronomi, Stockholms universitet(斯德哥尔摩大学天文系);AlbaNova universitetscentrum(阿尔巴诺瓦大学中心);Institute for Advanced Study, Tsinghua University(清华大学高等研究院);Department of Astronomy, Tsinghua University(清华大学天文系);Department of Earth and Planetary Science, The University of Tokyo(东京大学地球行星科学系);Department of Physics, Faculty of Science, Chulalongkorn University(朱拉隆功大学理学院物理系);Institute for Astrophysical Research and Department of Astronomy, Boston University(波士顿大学天体物理研究所及天文系)
Helium emission from Balmer-dominated shocks in Type Ia supernova remnants provides constraints to their progenitor systems
The University of New South Wales(新南威尔士大学);Australian National University(澳大利亚国立大学);Towson University(陶森大学);Naval Research Laboratory(海军研究实验室);Trinity College Dublin, The University of Dublin(都柏林三一学院,都柏林大学)