arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1112.0902astro-ph.SR
收藏

周期间隙上沿CV的低态

The low states of CVs at the upper edge of the period gap

P. Rodríguez-Gil, L. Schmidtobreick, K. S. Long, T. Shahbaz, B. T. Gänsicke, M. A. P. Torres

摘要:

我们回顾我们的知识的起源和现象学的低状态(也被称为VY Scl状态)的灾变变量,特别强调灾变变量的人口发现的周期差距。这个轨道周期范围在大约3到4小时之间,是难以捉摸的SW Sextantis恒星的首选土地,当它们的供体恒星完全对流时,它们被认为即将进入间隙。尽管它们在我们理解激变变星演化的全貌中扮演着主要角色,但由于吸积盘在高态时的极端面纱亮度,对其组成恒星的研究几乎是不可能的。在这里,我们提出的第一个步骤的白矮星和施主星在这些VY Scl系统在低状态下的特性,和零星的吸积事件和卫星发射线的发现,如在AM Her系统在低状态下观察到的,这可能是有关的快速旋转的二级星的磁活动。

英文摘要:

We review our knowledge of the origin and phenomenology of low states (also known as VY Scl states) in cataclysmic variables, making special emphasis on the cataclysmic variable population found just above the period gap. This orbital period range between approximately 3 and 4 hours is the preferred land for the elusive SW Sextantis stars, which are believed to be about to enter the gap when their donor stars become fully convective. Despite their main role in our understanding of the whole picture of cataclysmic variable evolution, the study of their component stars is almost impossible due to the extreme veiling brightness of the accretion disc during the high state. Here we present the first steps toward the characterisation of the white dwarfs and the donor stars in these VY Scl systems in the low state, and the discovery of sporadic accretion events and satellite emission lines like those observed in the AM Her systems in the low state, which are likely related to magnetic activity of the fast rotating secondary stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑