arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.11336astro-ph.HE
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无磁白矮星双星吸积流的X射线观测

Accretion Flows in Nonmagnetic White Dwarf Binaries as Observed in X-rays

Solen Balman

摘要:

激变变星(CV)是具有白矮星(WD)原色的致密双星。CV和其他吸积WD双星(AWB)是有用的实验室研究吸积流,气体动力学,外流,瞬态爆发,和爆炸性核燃烧在不同的天体物理等离子体条件下。它们已经被研究了几十年,对于银河系X射线源的人口研究很重要。最近的空间和地面高分辨率光谱和定时研究,以及最近的调查表明,我们仍然有观测和理论的复杂性尚未回答。我审查吸积在AWB的光的X射线观测。我目前的X射线诊断的吸积在矮新星和磁盘爆发,新星样系统,和国家的研究盘风和外流的CNOCVs与比较和关系,经典和经常性的新星系统,AM CVns和共生系统。我讨论了如何对流热吸积流(ADAF样)的内部区域的吸积盘(合并与边界层区)在X-CV解释大多数的差异和复杂性,已经遇到的X射线观测。我强调如何闪烁的变化研究,从光学到X射线可以探针,以确定吸积的历史和磁盘结构,以及如何的时间和光谱变化的CV相关的LMXB和活动星系核。最后,我讨论的ADAF吸积流方面的吸积的性质,并详细说明它带来的解决方案和它的并发症,构建一个观测框架,以激励新的理论计算,引入这种流动类型的磁盘,外流和风模型与磁盘不稳定模型的爆发和新星爆发的AWB和WD物理,一般。

英文摘要:

Cataclysmic Variables (CVs) are compact binaries with white dwarf (WD) primaries. CVs and other accreting WD binaries (AWBs) are useful laboratories for studying accretion flows, gas dynamics, outflows, transient outbursts, and explosive nuclear burning under different astrophysical plasma conditions. They have been studied over decades and are important for population studies of galactic X-ray sources. Recent space- and ground-based high resolution spectral and timing studies, along with recent surveys indicate that we still have observational and theoretical complexities yet to answer. I review accretion in nonmagnetic AWBs in the light of X-ray observations. I present X-ray diagnostics of accretion in dwarf novae and the disk outbursts, the nova-like systems, and the state of the research on the disk winds and outflows in the nonmagnetic CVs together with comparisons and relations to classical and recurrent nova systems, AM CVns and Symbiotic systems. I discuss how the advective hot accretion flows (ADAF-like) in the inner regions of accretion disks (merged with boundary layer zones) in nonmagnetic CVs explain most of the discrepancies and complexities that have been encountered in the X-ray observations. I stress how flickering variability studies from optical to X-rays can be probes to determine accretion history and disk structure together with how the temporal and spectral variability of CVs are related to that of LMXBs and AGNs. Finally, I discuss the nature of accretion in nonmagnetic WDs in terms of ADAF-like accretion flows, and elaborate on the solutions it brings and its complications, constructing an observational framework to motivate new theoretical calculations that introduce this flow-type in disks, outflow and wind models together with disk-instability models of outbursts and nova outbursts in AWBs and WD physics, in general.

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