天蝎座上部恒星间的视非共形性：用磁抑制对流模型解决问题
Apparent Non-Coevality among the Stars in Upper Scorpio: Resolving the Problem using a Model of Magnetic Inhibition of Convection
摘要：
USCO星协中的两颗食双星最近获得了该星协中4颗低质量成员的质量和半径的精确值。标准的演化模型会要求这些dM4.5 -dM 5恒星的年龄要比星协中更大质量恒星的年龄年轻，年轻的系数（在极端情况下）可能高达~3。因此，星协中的恒星不是同时代的吗？我们认为，答案是否定的：通过纳入对流开始的磁抑制的影响，我们表明，在USCO的恒星可以恢复到coevality提供的4个低质量的成员星有垂直的表面场在200 - 700 G的范围。在其他年轻星团中某些太阳型恒星的表面上已经测量到了这种强度的场。
英文摘要：
Two eclipsing binaries in the USco association have recently yielded precise values of masses and radii for 4 low-mass members of the association. Standard evolution models would require these dM4.5 - dM5 stars to have ages which are younger than the ages of more massive stars in the association by factors which appear (in extreme cases) to be as large as ~3. Are the stars in the association therefore non-coeval? We suggest that the answer is No: by incorporating the effects of magnetic inhibition of convective onset, we show that the stars in USco can be restored to coevality provided that the 4 low-mass member stars have vertical surface fields in the range 200 - 700 G. Fields of such magnitude have already been measured on the surface of certain solar-type stars in other young clusters.
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