2FGL J1653 .6-0159：蒸发脉冲星双星周期的新低
2FGL J1653.6-0159: A New Low in Evaporating Pulsar Binary Periods
摘要：
我们确定了一个轨道周期P_b= 4488 s的光学双星，它可能是费米源2FGL J1653.6-0159的对应物。虽然还没有探测到脉动，但源的性质与蒸发毫秒脉冲双星一致; P_b= 75 min是自旋动力系统的最低记录。伴星的加热面表现出相干的径向速度变化，当f（M）=1.60+/-0.05 M_sun时，振幅K=666.9+/-7.5 km/s。这种加热表明脉冲星的光度约为3x10^34 erg/s。颜色和光谱显示在二进制最小值处占主导地位的额外硬发射。其起源目前尚不清楚。这个系统类似于PSR J1311-3430，有一个低质量的贫氢伴星，一个密集的恒星风，可能还有一颗大质量的脉冲星。
英文摘要：
We have identified an optical binary with orbital period P_b=4488s as the probable counterpart of the Fermi source 2FGL J1653.6-0159. Although pulsations have not yet been detected, the source properties are consistent with an evaporating millisecond pulsar binary; this P_b=75min is the record low for a spin-powered system. The heated side of the companion shows coherent radial velocity variations, with amplitude K=666.9+/-7.5 km/s for a large mass function of f(M)=1.60+/-0.05 M_sun. This heating suggests a pulsar luminosity ~3x10^34 erg/s. The colors and spectra show additional hard emission dominating at binary minimum. Its origin is, at present, unclear. This system is similar to PSR J1311-3430, with a low mass H-depleted companion, a dense shrouding wind and, likely, a large pulsar mass.
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