分离双WD双星相对论性聚束效应的地基测量
A ground-based measurement of the relativistic beaming effect in a detached double WD binary
摘要：
我们报告的第一个地面测量的相对论性波束效应（又名多普勒增强）。我们观测到了分离的、无相互作用的食双白矮星（WD）双星NLTT 11748中的光束效应。我们的观测是由系统的高质量比和低光度比，导致一个大的光束诱导的变化幅度在5.6小时的轨道周期的动机。我们观察了3个晚上在2.0米福克斯望远镜北SDSS-g'过滤器，并同时拟合数据的光束，椭球和反射效应。我们拟合的相对光束振幅为（3.0 +/- 0.4）x 10^（-3），与给定测光初级径向速度振幅和有效温度的黑体光谱的预期振幅一致。这一结果是在NLTT 11748和类似系统中测试光度光束振幅和光谱径向速度振幅之间关系的第一步。我们没有发现任何变化，由于椭球或反射效应，与他们的预期不可检测的振幅为这个系统一致。低质量的氦核WD预计会存在于双星系统中，在其中一些系统中，双星伴星是一个微弱的C/O WD，两颗恒星是分离的，没有相互作用，就像NLTT 11748一样。这种聚束效应可用于宽波段测光寻找这类系统中的暗伴星。
英文摘要：
We report on the first ground-based measurement of the relativistic beaming effect (aka Doppler boosting). We observed the beaming effect in the detached, non-interacting eclipsing double white dwarf (WD) binary NLTT 11748. Our observations were motivated by the system's high mass ratio and low luminosity ratio, leading to a large beaming-induced variability amplitude at the orbital period of 5.6 hr. We observed the system during 3 nights at the 2.0m Faulkes Telescope North with the SDSS-g' filter, and fitted the data simultaneously for the beaming, ellipsoidal and reflection effects. Our fitted relative beaming amplitude is (3.0 +/- 0.4) x 10^(-3), consistent with the expected amplitude from a blackbody spectrum given the photometric primary radial velocity amplitude and effective temperature. This result is a first step in testing the relation between the photometric beaming amplitude and the spectroscopic radial velocity amplitude in NLTT 11748 and similar systems. We did not identify any variability due to the ellipsoidal or reflection effects, consistent with their expected undetectable amplitude for this system. Low-mass, helium-core WDs are expected to reside in binary systems where in some of those systems the binary companion is a faint C/O WD and the two stars are detached and non-interacting, as in the case of NLTT 11748. The beaming effect can be used to search for the faint binary companion in those systems using wide-band photometry.
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