Chemical surface inhomogeneities in late B-type stars with Hg and Mn peculiarity - I. Spot evolution in HD 11753 on short and long time scales

Chemical surface inhomogeneities in late B-type stars with Hg and Mn peculiarity - I. Spot evolution in HD 11753 on short and long time scales
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具有 Hg 和 Mn 特性的晚期 B 型恒星的化学表面不均匀性 - I HD 11753 中短期和长期尺度的光点演化

DOI:
10.1051/0004-6361/201220951
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发表时间:
2013
影响因子:
6.5
通讯作者:
W. Pessemier
W. Pessemier
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
H. Korhonen;J. F. González;M. Briquet;M. Flores Soriano;S. Hubrig;I. Savanov;T. Hackman;I. Ilyin;E. Eulaers;W. Pessemier

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AimsTime系列的高分辨率光谱的晚B型星星HD 11753表现出HgMn化学特性被用来研究不同的化学元素的表面分布和它们的时间evolution.MethodsHigh-resolution和高信噪比的光谱,获得了使用CORALIE摄谱仪在La Silla在2000年,2009年和2010年。使用多普勒成像技术计算Y II、Sr II、Ti II和Cr II的表面图。还将结果与等效宽度测量值进行了比较。化学斑点的演化在短和长的时间scales.ResultsWe确定的双星轨道HD 11753和微调的旋转周期的主要。早期发现的快速演变的化学斑点的化学斑点图和等效宽度测量的分析证实。此外,一个长期的整体Y二和Sr二丰度的减少被发现。化学斑点配置的详细分析揭示了一些可能的证据,一个非常弱的差异旋转是在HD 11753操作。
AimsTime series of high-resolution spectra of the late B-type star HD 11753 exhibiting HgMn chemical peculiarity are used to study the surface distribution of different chemical elements and their temporal evolution.MethodsHigh-resolution and high signal-to-noise ratio spectra were obtained using the CORALIE spectrograph at La Silla in 2000, 2009, and 2010. Surface maps of Y ii, Sr ii, Ti ii, and Cr ii were calculated using the Doppler imaging technique. The results were also compared to equivalent width measurements. The evolution of chemical spots both on short and long time scales were investigated.ResultsWe determine the binary orbit of HD 11753 and fine-tune the rotation period of the primary. The earlier discovered fast evolution of the chemical spots is confirmed by an analysis using both the chemical spot maps and equivalent width measurements. In addition, a long-term decrease in the overall Y ii and Sr ii abundances is discovered. A detailed analysis of the chemical spot configurations reveals some possible evidence that a very weak differential rotation is operating in HD 11753.
HgMn星中汞的元素丰度和同位素混合物
DOI: 10.1051/0004-6361:20030213
发表时间: 2003
影响因子: 6.5
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Linus Dolk;G. Wahlgren;S. Hubrig
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DOI: 10.1051/0004-6361/200913775
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