在RZ Psc中引起UX Ori现象的活动小行星带
An active asteroid belt causing the UX Ori phenomenon in RZ Psc
摘要：
我们报告中红外过量发射的年轻对象RZ PSC的发现。这一过剩量约占其Lbol的8%，并且与一个500K黑体很好地拟合，这意味着光学厚尘埃的无尘区在0.7AU以内。该天体显示尘埃遮蔽事件（UXOR行为），其时间尺度表明尘埃物质在0.5天文单位的轨道上。我们还报告了一个12.4年的周期性光度变化，这可以解释为由于扰动的尘埃分布。该系统的特点是高倾角，边缘消光（在明亮的光度状态下），单一的温度为温暖的尘埃，和年龄估计，使恒星超越形成阶段。我们建议，尘埃掩星事件提出了一个动态的看法，一个活跃的小行星带的碰撞产物偶尔掩盖中央恒星。
英文摘要：
We report the discovery of mid-infrared excess emission in the young object RZ Psc. The excess constitutes ~8% of its Lbol, and is well fit by a single 500K black-body implying a dust free region within 0.7AU for optically thick dust. The object displays dust obscuration events (UXOR behaviour) with a time-scale that suggests dusty material on orbits of 0.5AU. We also report a 12.4 year cyclical photometric variability which can be interpreted as due to perturbations in the dust distribution. The system is characterized by a high inclination, marginal extinction (during bright photometric states), a single temperature for the warm dust, and an age estimate which puts the star beyond the formation stage. We propose that the dust occultation events present a dynamical view of an active asteroid belt whose collisional products sporadically obscure the central star.
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