双白矮星双星食时的质量约束
Mass Constraints from Eclipse Timing in Double White Dwarf Binaries
摘要：
我证明了一个类似于罗默延迟的效果，熟悉的定时射电望远镜，应该是在第一个食双白矮星（WD）的二进制，NLTT 11748检测。通过测量二次日食和一次日食之间的时间差，从半个周期（4.6秒），人们可以确定轨道的物理大小，从而限制单个WD的质量。不确定度小于0.1秒的测量-用现代大型望远镜是可能的-当与高质量（<1 km/s）的径向速度数据相结合时，将确定单个质量为+/-0.02 Msun，尽管偏心率也必须高精度地知道（+/-1e-3）。质量约束随着P^{-1/2}（其中P是轨道周期）而改善，因此这在宽双星中效果最好，甚至对于非简并恒星也应该是可检测的，但是这样的约束要求质量比不同于一个和未扭曲的轨道。
英文摘要：
I demonstrate that an effect similar to the Roemer delay, familiar from timing radio pulsars, should be detectable in the first eclipsing double white dwarf (WD) binary, NLTT 11748. By measuring the difference of the time between the secondary and primary eclipses from one-half period (4.6 s), one can determine the physical size of the orbit and hence constrain the masses of the individual WDs. A measurement with uncertainty <0.1 s---possible with modern large telescopes---will determine the individual masses to +/-0.02 Msun when combined with good-quality (<1 km/s) radial velocity data, although the eccentricity must also be known to high accuracy (+/- 1e-3). Mass constraints improve as P^{-1/2} (where P is the orbital period), so this works best in wide binaries and should be detectable even for non-degenerate stars, but such constraints require the mass ratio to differ from one and undistorted orbits.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
