Fine Structure in the Circumstellar Environment of a Young, Solar‐like Star: The Unique Eclipses of KH 15D
Fine Structure in the Circumstellar Environment of a Young, Solar‐like Star: The Unique Eclipses of KH 15D
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年轻类太阳恒星的绕星环境中的精细结构：KH 15D 的独特日食
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
A. Riffeser
中科院分区：
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作者：
W. Herbst;C. Hamilton;F. Vrba;M. Ibrahimov;C. Bailer;R. Mundt;M. Lamm;T. Mazeh;Z. Webster;K. Haisch;E. Williams;Andrew H. Rhodes;T. Balonek;A. Scholz;A. Riffeser
报道了一项对唯一的主序前食天体KH 15D进行光度监测的国际活动的结果。得出了这次月食的更新星历，其中包含了48.36天的轻微修正周期。有一些证据表明，轨道周期实际上是这个值的两倍，每个周期发生两次日食。日食的超常深度(∼3.5mag)和持续时间(∼18天)表明，它是由星周物质引起的，推测是圆盘的内部。日食随着时间的推移继续延长，中心亮度倒转也不像以前那么极端。V−R和V−I颜色表示系统在接近最低光线时略显蓝色。入口和出口非常好地模拟了刀刃穿过一颗四肢昏暗的恒星的过程。简要讨论了该系统的可能模型。
Results of an international campaign to photometrically monitor the unique pre–main‐sequence eclipsing object KH 15D are reported. An updated ephemeris for the eclipse is derived that incorporates a slightly revised period of 48.36 days. There is some evidence that the orbital period is actually twice that value, with two eclipses occurring per cycle. The extraordinary depth (∼3.5 mag) and duration (∼18 days) of the eclipse indicate that it is caused by circumstellar matter, presumably the inner portion of a disk. The eclipse has continued to lengthen with time, and the central brightness reversals are not as extreme as they once were. V−R and V−I colors indicate that the system is slightly bluer near minimum light. Ingress and egress are remarkably well modeled by the passage of a knife edge across a limb‐darkened star. Possible models for the system are briefly discussed.