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arXiv 1709.07579astro-ph.HE
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MAXI/GSC和Fermi/GBM观测到的12 Be双星爆发时光度和自旋周期变化的相关性

Correlation between the luminosity and spin-period changes during outbursts of 12 Be binary pulsars observed by the MAXI/GSC and the Fermi/GBM

Mutsumi Sugizaki, Tatehiro Mihara, Motoki Nakajima, Kazuo Makishima

摘要:

为了从观测上研究吸积力矩对吸积双星自旋周期的影响,利用MAXI/GSC全天巡天观测数据和Fermi/GBM脉冲星计划测量的12 Be双星的X射线光变曲线,对2009年8月至2016年3月的6年多时间进行了分析。之所以选择这12个天体,是因为它们具有清晰的光学识别和表面磁场的精确测量。用$L\gtrsim 1\times 10^{37}$ erg s $^{-1}$在大爆发期间测量的光度$L$和自旋频率导数$\dotν$,被发现近似地遵循以$\dotν \propto L^α$($α\simeq 1$)表示的吸积力矩模型中的理论关系,并且$\dotν$和$L^α$之间的比例系数在$\sim 3$的因子内与Ghosh & Lamb(1979)提出的结果一致。在本研究过程中,对若干来源的轨道要素进行了改进。

英文摘要:

To observationally study spin-period changes of accreting pulsars caused by the accretion torque, the present work analyzes X-ray light curves of 12 Be binary pulsars obtained by the MAXI/GSC all-sky survey and their pulse periods measured by the Fermi/GBM pulsar project, both covering more than 6 years from 2009 August to 2016 March. The 12 objects were selected because they are accompanied by clear optical identification, and accurate measurements of surface magnetic fields. The luminosity $L$ and the spin-frequency derivatives $\dotν$, measured during large outbursts with $L\gtrsim 1\times 10^{37}$ erg s$^{-1}$, were found to approximately follow the theoretical relations in the accretion torque models, represented by $\dotν \propto L^α$ ($α\simeq 1$), and the coefficient of proportionality between $\dotν$ and $L^α$, agrees, within a factor of $\sim 3$, with that proposed by Ghosh & Lamb (1979). In the course of the present study, the orbital elements of several sources were refined.

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