Hydrogen lines in LAMOST low-resolution spectra of RR Lyrae stars
Hydrogen lines in LAMOST low-resolution spectra of RR Lyrae stars
复制标题
天琴座 RR 星 LAMOST 低分辨率光谱中的氢谱线
DOI：
10.1016/j.newast.2013.06.002
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发表时间：
2014-01-01
期刊：
影响因子：
2
通讯作者：
Zhao, Y.
中科院分区：
文献类型：
--
作者：
Yang, F.;Deng, L.;Zhao, Y.
LAMOST试验性巡天产生了包含60多万个恒星光谱的数据发布。通过与银河系高纬度地区的RR型天琴座星的大型时间序列光度数据库交叉检查，我们发现了157个RR型天琴座星，已经用LAMOST观测。在这个样本中，我们成功地捕获了三颗处于快速膨胀阶段的RR型天琴座星，它们都在巴尔末线区域显示出高超音速激波特征。我们拟合了He线区域的形状，并确定在加宽的He吸收线内看到的发射特征表明这三个物体的大气中存在高超音速相对运动。通过对数百万颗恒星的LAMOST巡天，我们计划捕获大样本的高超声速膨胀阶段的RR型天琴座星，从而为研究RR型天琴座星的内部结构和脉动机制提供大型数据库。(C)2013作者Elsevier B.V.出版，保留所有权利。
The LAMOST pilot survey has produced a data release containing over 600,000 stellar spectra. By crosschecking with a large time series photometric database of RR Lyrae stars in high Galactic latitude regions, we found a total number of 157 RR Lyrae stars that have been observed with LAMOST. In this sample, we successfully captured three RR Lyrae stars in the fast expansion phase, all of them showing hypersonic shock wave features in the Balmer line region. We fit the shape of He line region and determine that the emission feature seen within the broadened He absorption line suggests hypersonic relative motion in the atmospheres of these three objects. With a further LAMOST survey of millions of stars, we plan to capture a large sample of RR Lyrae stars in their hypersonic expansion phase, and therefore provide a large database for the study of the internal structure and the pulsation mechanism of RR Lyrae stars. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.