论文标题
在首次过时和多模式RR Lyrae变量中氢排放的可能证据
Possible evidence of hydrogen emission in the first-overtone and multi-mode RR Lyrae variables
论文作者
论文摘要
由于光谱镜观察到的有限，在非算法模式RR Lyre恒星中的冲击波的性质仍然是一个谜。我们将模式识别算法应用于来自SDSS和LAMOST的光谱数据，并报告了第一个过时和多模式RR Lyrae星中氢发射的第一个证据，显示了“第一个幻影”，这是RR Lyre variables中最突出的电击特征。我们在SDSS中发现了十颗RRC恒星，Lamost中的十个RRC星，在Lamost中发现了三颗RRD Star，显示了Blueshifted Balmer排放。发射特征可能表明了冲击波的存在。我们计算发射线的径向速度，这与冲击波辐射区域发生的物理条件有关。使用来自ZTF的光度观测值，我们为可能的调制液提供了一个带有氢发射RRDL3的RRD恒星之一的频率分析的详细光曲线分析。随着可变恒星的大量光谱观测值，我们的研究提高了将无法解释的Blazhko效应连接到非基本模式RR Lyre恒星中的冲击波的可能性。
The nature of shock waves in non-fundamental mode RR Lyrae stars remains a mystery because of limited spectroscopic observations. We apply a pattern recognition algorithm on spectroscopic data from SDSS and LAMOST and report the first evidence of hydrogen emission in first-overtone and multi-mode RR Lyrae stars showing the "first apparition", which is the most prominent observational characteristic of shock in RR Lyrae variables. We find ten RRc stars in SDSS, ten RRc stars in LAMOST, and three RRd stars in LAMOST that show blueshifted Balmer emissions. The emission features possibly indicate the existence of shock waves. We calculate the radial velocities of the emission lines, which are related to the physical conditions occurring in the radiative zone of shock waves. Using photometric observations from ZTF, we present a detailed light curve analysis for the frequency components in one of our RRd stars with hydrogen emission, RRdl3, for possible modulations. With the enormous volume of upcoming spectral observations of variable stars, our study raises the possibility of connecting the unexplained Blazhko effect to shock waves in non-fundamental mode RR Lyrae stars.
