论文标题
V715 PER的北向光曲线：磁层中是否有灰尘？
The dipper light curve of V715 Per: is there dust in the magnetosphere?
论文作者
论文摘要
年轻恒星物体中的北向光曲线通常被解释为恒星周围尘埃的部分或总掩盖。 在这项工作中，我们分析了位于年轻恒星形成区域IC 348的V715光曲线的幅度。多年来收集的观测表明，尘埃灭绝事件可以解释光曲线。 在我们的模型中，灰尘根据恒星磁场的强度分布在磁层内。灰尘分布由场的垂直分量调节，该轴相对于旋转轴未对准。我们包括一个模型，用于蒸发到达磁层的灰尘，以始终如一地计算其分布。 对于V715，每个磁盘截断半径处的光学厚经纱中有灰尘。我们建议，光曲线是由磁层内部尘埃延伸引起的灭绝来解释的。灰尘分布在光学上很薄，由于高温和低密度，它无法长期生存。但是，由于晶粒迅速向恒星表面移动并且升华不是瞬时的，因此有一层灰尘覆盖磁层负责灭绝。 在磁层积聚流的恶劣条件下幸存下来的灰尘可能是北斗弯曲曲线的原因。
The dipper optical light curves in young stellar objects are commonly interpreted as partial or total occultation of the stellar radiation by dust surrounding the star. In this work, we analyze the amplitude of the optical light curve of V715 Per, located in the young star forming region IC 348. Observations gathered over the years suggest that the light curve can be explained by dust extinction events. In our model, the dust is distributed inside the magnetosphere according to the strength of the stellar magnetic field. The dust distribution is modulated by the vertical component of the field, whose axis is misaligned with respect to the rotational axis. We include a model for the evaporation of the dust reaching the magnetosphere in order to consistently calculate its distribution. For V715 Per, there is dust in the optically thick warp at the disk truncation radius. We suggest that the optical light curve is explained by extinction caused by dust reaching inside the magnetosphere. The dust distribution is optically thin and due to the high temperature and low density, it cannot survive for a long time. However because the grains rapidly move towards the stellar surface and the sublimation is not instantaneous, there is a layer of dust covering the magnetosphere responsible for the extinction. Dust surviving the harsh conditions of the magnetospheric accretion flow may be responsible for some of the dipper light curves.
