Discovery of non-radial pulsations in the white dwarf primary of a cataclysmic variable star
Discovery of non-radial pulsations in the white dwarf primary of a cataclysmic variable star
复制标题
在灾变变星的白矮星初级中发现非径向脉动
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
Liza Marie.
中科院分区：
文献类型：
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作者：
Van Zyl;Liza Marie.
星震学领域为研究脉动的白矮星提供了强大的技术。如果这些技术能够应用于激变变星的白矮星原生现象，那么研究相互作用双星系统中的吸积现象将大有裨益。我们对白矮星脉动体中正常模式的理解同样会从研究它们对吸积的反应中受益。本文分析了D~RF变星GW Librae的初步观测结果，这是发现的第一颗具有日初级的激变变星。简要介绍了激变变星和脉动白矮星，并讨论了GW Librae对这些研究领域的意义。在这篇论文中，我给出了1997-1998年间在GW Librae上获得的7周的高速CCD观测结果的分析。脉动谱的能量主要集中在S 376点和S 650点附近。天秤座GW的脉动谱具有明显的月变化，这是脉动DA白矮星的典型特征。
The field of Asteroseismology provides powerful techniques for the study of pulsating white dwarf stars. If these techniques could be anpli~d to the white dwarf primaries of Cataclysmic Variable stars, the study of accretion in interacting binary systems would benefit enormously. Our understanding of normal modes in white dwarf pulsators would benefit likewise from the study of how they respond to accretion. This dissertation presents the a!!alysis of preliminary observations of the D~rf ova GW Librae, the first Cataclysmic Variable star found to have a DAY primary. A brief introduction to Cataclysmic Variables and the pulsating white dwarfs is given, and the significance of GW Librae to these fields of study is discussed. In this dissertation I present the analysis of 7 weeks of high speed CCD observations obtained on GW Librae during 1997 and 1998. The power in the pulsation spectrum concentrates principally in regions near 376 s and 650 s. GW Librae has a pulsation spectrum that shows dramatic changes on a monthly basis, typical of the pulsating DA white dwarfs.