SDSS J085414.02+390537.3——一颗新的异步偏振星
SDSS J085414.02+390537.3 -- a new asynchronous polar
AI总结：
本文利用ZTF测光数据发现SDSS J085414.02+390537.3是一颗新的异步偏振星，测得其拍周期为24.6天、自转与轨道周期异步度0.3%，并通过塞曼分裂和回旋谱建模估算了白矮星磁场强度。
摘要：
利用ZTF测光巡天的数据揭示了偏振星SDSS J085414.02+390537.3的异步性。光变曲线显示出一个拍周期P_beat = 24.6 ± 0.1天。在该周期内，系统的亮度变化约为3^m。周期图显示在白矮星自转周期P_spin = 113.197 ± 0.001分钟和轨道周期P_orb = 113.560 ± 0.001分钟处存在功率峰，相应的偏振星异步度为1-P_orb/P_spin = 0.3%。该偏振星的光度行为表明在拍周期内主吸积极发生了改变。基于Hβ线的塞曼分裂，估算出白矮星的平均磁场强度为B = 28.5 ± 1.5 MG。通过回旋辐射谱建模发现磁极附近的磁场强度B ≈ 34 MG。Hβ线的多普勒层析图展示了偏振星典型的发射源分布。
英文摘要：
The asynchrony of the polar SDSS~J085414.02+390537.3 was revealed using the data of ZTF photometric survey. The light curves show a beat period $P_{beat} = 24.6 \pm 0.1$~days. During this period the system changes its brightness by $\sim 3^m$. The periodograms show power peaks at the white dwarf's rotation period $P_{spin} = 113.197 \pm 0.001$~min and orbital period $P_{orb} = 113.560 \pm 0.001$~min with the corresponding polar asynchrony $1-P_{orb}/P_{spin} = 0.3\%$. The photometric behavior of the polar indicates a change of the main accreting pole during the beat period. Based on the Zeeman splitting of the H$β$ line, an estimate of the mean magnetic field strength of the white dwarf is found to be $B = 28.5\pm 1.5$~MG. The magnetic field strength $B \approx 34$~MG near the magnetic pole was found by modeling cyclotron spectra. Doppler tomograms in the H$β$ line demonstrate the distribution of emission sources typical for polars.
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