arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.06358astro-ph.HEastro-ph.SR
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XTE的光学、J和K光变曲线J1118 +480 = KV UMa:黑洞的质量和非恒星成分的光谱

Optical, J, and K light curves of XTE J1118+480 = KV UMa: the mass of the black hole and the spectrum of the non-stellar component

A. M. Cherepashchuk, N. A. Katysheva, T. S. Khruzina, S. Yu. Shugarov, A. M. Tatarnikov, A. I. Bogomazov

摘要:

介绍了2017-2018年获得的KV UMa黑洞X射线新星在静止状态下的光学、J和K光度观测结果。虽然在350天内系统的平均亮度衰减了$\approx 0.1^m$,但没有检测到光变曲线内的显著闪烁。平均亮度的变化并不伴随着闪烁的增加或减少。由五条光变曲线的模拟,得到了KV UMa轨道的倾角和黑洞质量:$i=74^{\circ}\pm 4^{\circ}$,$M_{BH}=(7.06÷7.24)M_{\odot}$依赖于所用的质量比。在$λ=6400÷22000$-1范围内的光谱的非恒星成分可以通过幂律$F_λ\sim λ^α$,$α\approx -1.8$来拟合。吸积盘的方位角随时代的不同而变化。星星上有斑点的模型是不够的。利用Scenario Machine程序对低质量X射线双星进行了演化计算,计算中考虑了最近发现的轨道周期急剧减小的现象。我们发现,观测到的减少可以与光学伴星的磁场在共同包层阶段增加的磁性星风相一致。对演变情景参数进行了若干限制。

英文摘要:

Optical, J, and K photometric observations of the KV UMa black hole X-ray nova in its quiescent state obtained in 2017-2018 are presented. A significant flickering within light curves was not detected, although the average brightness of the system faded by $\approx 0.1^m$ during 350 days. Changes in the average brightness were not accompanied with the increase or the decrease of the flickering. From the modelling of five light curves the inclination of the KV UMa orbit and the black hole mass were obtained: $i=74^{\circ}\pm 4^{\circ}$, $M_{BH}=(7.06÷7.24)M_{\odot}$ dependently on the used mass ratio. The non-stellar component of the spectrum in the range $λ=6400÷22000$Å can be fitted by a power law $F_λ\sim λ^α$, $α\approx -1.8$. The accretion disk orientation angle changed from one epoch to another. The model with spots on the star was inadequate. Evolutionary calculations using the "Scenario Machine" code were performed for low mass X-ray binaries, a recently discovered anomalously rapid decrease of the orbital period was taken into account. We showed that the observed decrease can be consistent with the magnetic stellar wind of the optical companion which magnetic field was increased during the common envelope stage. Several constraints on evolutionary scenario parameters were done.

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