Outbursts of the black hole X-ray transient KV UMa (XTE J1118+480) in the optical band

Outbursts of the black hole X-ray transient KV UMa (XTE J1118+480) in the optical band
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光波段黑洞 X 射线瞬变 KV UMa (XTE J1118 480) 的爆发

DOI:
10.1017/pasa.2019.47
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发表时间:
2020
影响因子:
6.3
通讯作者:
Šimon, Vojtěch
Šimon, Vojtěch
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Šimon, Vojtěch

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KV Uma(XTE J1118+480)是一颗X射线双星,已知在2000年和2005年经历爆发。本文介绍了在档案照相底片上发现的1927年开始的一次大爆发,并对该系统的长期光学活动进行了分析。我们使用了来自DASCH(数字访问天空世纪@哈佛)的摄影数据。我们把1927年爆发的背景下观察到的爆发的KV UMa。我们表明,这是一个双重事件,与2000年爆发的前兆类似。我们发现1927年和2000年的大爆发之间的差距的长度方面的前兆和主突出的差距有很大的差异。1927年大于250 d,而2000年约为20 d,尽管所有峰的亮度相互比较。我们还表明,KV UMa的各个光学爆发的亮度缓慢下降阶段的持续时间(有时大致是一个平台)彼此不同。这决定了整个主爆发的长度。无论是峰值强度和亮度的爆发时,缓慢下降过渡到一个陡峭的最后衰减分支可复制在所有三个爆发。在解释中,短的前体的持续时间是由于这样一个事实,即只有热粘性不稳定性在吸积盘,而盘的潮汐不稳定性在随后的主要爆发作出了贡献。
KV UMa (XTE J1118+480) is an X-ray binary that is known to undergo outbursts in 2000 and 2005. This paper presents the discovery of a large outburst starting in 1927 on the archival photographic plates and an analysis of the long-term optical activity of this system. We used the photographic data from DASCH (Digital Access to a Sky Century @ Harvard). We placed the 1927 outburst in the context of the observed outbursts of KV UMa. We show that it is a double event, with a precursor similar to the one of the outbursts in 2000. We find a big difference between the 1927 and 2000 outbursts as regards the length of the gap between the precursor and the main outburst. It is more than 250 d in 1927, whereas it is about 20 d in 2000, although the brightnesses of all peaks are mutually comparable. We also show that the individual optical outbursts of KV UMa differ from each other by the duration of the stage of a slow decline of brightness (sometimes roughly a plateau). This determines the length of the entire main outburst. Both the peak magnitude and the brightness of the outburst when the slow decline transitions to a steep final decaying branch plausibly reproduce in all three outbursts. In the interpretation, the short duration of the precursor is caused by the fact that only the thermal-viscous instability operated in the accretion disk while also the tidal instability of the disk contributed in the subsequent main outburst.
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影响因子: --
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