Remarkable spectral variability on the spin period of the accreting white dwarf in V455 And

Remarkable spectral variability on the spin period of the accreting white dwarf in V455 And
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V455 和 V455 中吸积白矮星自旋周期的显着光谱变化

DOI:
10.1093/mnras/sts622
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发表时间:
2013
影响因子:
4.8
通讯作者:
Bloemen S
Bloemen S
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bloemen S

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本文报道了吸积中的白色矮双星V455 And的自旋分辨光谱。它的自转周期只有67秒,是已知自转最快的白色矮星之一。为了研究白色矮星自转周期的光谱变化,我们观测了积分时间为2 s的V455 And,它明显短于白色矮星的自转周期。为了实现这种节奏,我们使用了4.2米威廉赫歇尔望远镜ISIS光谱仪的蓝臂,配备了电子倍增CCD(EMCCD)。在我们的时间序列中检测到强相干信号,这导致了对白色矮星的自旋周期(Pspin= 67.619 ± 0.002 s)的可靠确定。在白色矮星的自旋周期上折叠光谱,发现了Hγ、Heiλ4472和Heiiλ4686中非常复杂的发射线变化。我们将观测到的自旋相位依赖性的发射线形状的存在下,通过吸积幕的白色矮星的磁控吸积,符合中间极性型系统。然而,我们不知道有任何特定的模型可以定量解释我们在观测中发现的复杂速度变化。在光谱线的轨道变化表明,吸积盘的V455和是相当无结构的,相反的光盘的原型的中间极,DQ Her。这项工作表明了潜在的EMCCD观察微弱的目标在高节奏,读出噪声将使这样的研究不可能与传统的CCD。
We present spin-resolved spectroscopy of the accreting white dwarf binary V455 And. With a suggested spin period of only 67 s, it has one of the fastest spinning white dwarfs known. To study the spectral variability on the spin period of the white dwarf, we observed V455 And with 2 s integration times, which is significantly shorter than the spin rate of the white dwarf. To achieve this cadence, we used the blue arm of the ISIS spectrograph at the 4.2-m William Herschel Telescope, equipped with an electron multiplying CCD (EMCCD). Strong coherent signals were detected in our time series, which led to a robust determination of the spin period of the white dwarf (Pspin= 67.619 ± 0.002 s). Folding the spectra on the white dwarf spin period uncovered very complex emission line variations in Hγ, Heiλ4472 and Heiiλ4686. We attribute the observed spin phase dependence of the emission line shape to the presence of magnetically controlled accretion on to the white dwarf via accretion curtains, consistent with an intermediate polar type system. We are, however, not aware of any specific model that can quantitatively explain the complex velocity variations we detect in our observations. The orbital variations in the spectral lines indicate that the accretion disc of V455 And is rather structureless, contrary to the disc of the prototype of the intermediate polars, DQ Her. This work demonstrates the potential of EMCCDs to observe faint targets at high cadence, as readout noise would make such a study impossible with conventional CCDs.
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