轩辕十四的扁率对其伴星运动的影响
The impact of the oblateness of Regulus on the motion of its companion
摘要：
最近发现一颗暗伴星以周期P_b = 40.11（2）d的近圆轨道绕着高速旋转的B星轩辕十四运行。轩辕十四的赤道半径R_e比极半径R_p大32%，具有显著的四极质量矩Q。我们研究了Q对其伴星轨道周期P_b的影响，以便在目前测量P_b的精度水平下，看看它们是否是可测量的。相反，我们将寻找偏离开普勒定律的地方，因为轩辕十四的四极质量矩Q限制了系统质量的比值γ=m/M。
英文摘要：
The fast spinning B-star Regulus has recently been found to be orbited by a fainter companion in a close circular path with orbital period P_b = 40.11(2) d. Being its equatorial radius R_e 32% larger than the polar one R_p, Regulus possesses a remarkable quadrupole mass moment Q. We investigate the effects of Q on the orbital period P_b of its companion in order to see if they are measurable, given the present-day level of accuracy in measuring P_b. Conversely, we will look for deviations from the third Kepler law, attributed to the quadrupole mass moment Q of Regulus, to constrain the ratio γ=m/M of the system's masses.
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