LSPM J1314：一颗超大型磁星，无线电发射机制受到限制
LSPM J1314: An oversized magnetic star with constraints on the radio emission mechanism
摘要：
LSPM J1314+1320（=NLTT 33370）是一个双星系统，由两颗光谱类型几乎相同的前主序星组成。该系统在超冷矮星中是最引人注目的，因为它是在最宽的频率范围内最明亮的无线电发射器。根据标准（非磁性）演化模型，质量和光度乍一看与该系统在8000万年前的年龄一致。然而，这些模型预测的平均有效温度为2950 +/- 5 K，比经验值高180 K。因此，经验半径相对于标准模型过大约13%。我们证明了磁性恒星模型可以定量地解释尺寸过大。作为对我们模型的检查，我们注意到无线电发射限制了表面磁场强度：限制取决于识别无线电发射机制。我们发现，我们的磁模型所需的场强太强，不符合回旋同步辐射，但与电子回旋脉塞发射是一致的。
英文摘要：
LSPM J1314+1320 (=NLTT 33370) is a binary star system consisting of two nearly identical pre-main sequence stars of spectral type M7. The system is remarkable among ultracool dwarfs for being the most luminous radio emitter over the widest frequency range. Masses and luminosities are at first sight consistent with the system being coeval at age ~80 Myr according to standard (non-magnetic) evolutionary models. However, these models predict an average effective temperature, 2950 +/- 5 K, which is 180 K hotter than the empirical value. Thus, the empirical radii are oversized relative to the standard models by ~13%. We demonstrate that magnetic stellar models can account quantitatively for the oversizing. As a check on our models, we note that the radio emission limits the surface magnetic field strengths: the limits depend on identifying the radio emission mechanism. We find that the field strengths required by our magnetic models are too strong to be consistent with gyrosynchrotron emission, but are consistent with electron cyclotron maser emission.
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