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arXiv 1708.07355astro-ph.HEastro-ph.SR
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红背毫秒脉冲星双星3FGL J0212.1 + 5320的性质

Properties of the redback millisecond pulsar binary 3FGL J0212.1+5320

T. Shahbaz, M. Linares, R. P. Breton

摘要:

Linares等人(2016)获得了红背星系3FGL J0212.1 + 5320中二级恒星的准同步g ',r'和i波段光变曲线和吸收线径向速度曲线。光变曲线显示出两个极大值和极小值,这主要是由于第二颗恒星的椭球调制,但极大值和极小值不相等。我们拟合这些光变曲线和径向速度与我们的X射线双星模型,包括一个黑暗的太阳型的恒星斑点或热点,由于偏离中心加热从intrabinary冲击,占不平等的最大值。两种模型都给出了与观测一致的径向速度半振幅和旋转展宽。观测到的次级恒星的有效温度与使用热点模型获得的值最匹配,该模型给出中子星和次级恒星的质量分别为$M_{\rm 1}$ = 1.85 $^{+0.32}_{-0.26}$ $M_{\odot}$和$M_{\rm 2}$ = 0.50 $^{+0.22}_{-0.19}$ $M_{\odot}$。

英文摘要:

Linares et al. (2016) obtained quasi-simultaneous g', r' and i-band light curves and an absorption line radial velocity curve of the secondary star in the redback system 3FGL J0212.1+5320. The light curves showed two maxima and minima primarily due to the secondary star's ellipsoidal modulation, but with unequal maxima and minima. We fit these light curves and radial velocities with our X-ray binary model including either a dark solar-type star spot or a hot spot due to off-centre heating from an intrabinary shock, to account for the unequal maxima. Both models give a radial velocity semi-amplitude and rotational broadening that agree with the observations. The observed secondary star's effective temperature is best matched with the value obtained using the hot spot model, which gives a neutron star and secondary star mass of $M_{\rm 1}$=1.85$^{+0.32}_{-0.26}$ $M_{\odot}$and $M_{\rm 2}$=0.50$^{+0.22}_{-0.19}$ $M_{\odot}$, respectively.

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