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arXiv 1003.0351astro-ph.EP
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太阳型恒星周围的碎片云:用Spitzer Space Telescope观测昴星团

Debris Disks around Solar-Type Stars: Observations of the Pleiades with Spitzer Space Telescope

J. M. Sierchio, G. H. Rieke, K. Y. L. Su, P. Plavchan, J. R. Stauffer, N. I. Gorlova

摘要:

我们目前斯皮策MIPS观测在24微米的37个太阳型恒星在昴星团,并将它们与以前的观测,以获得一个样本的71颗恒星。我们报告说,23颗恒星,或32 +/-6.8%,有超过24微米至少10%以上的光球发射。我们比较我们的结果与其他疏散星团的碎片盘的研究和A型星的研究表明,碎片盘周围的太阳型恒星在115百万年发生在几乎相同的速度周围的A型恒星。我们分析了二元性和X射线活动对过剩通量的影响。具有超高温的恒星往往不属于等质量的双星系统,这可能是由于在类似轨道上的双星伴星清除了星子。我们发现,明显的反相关性的发病率过剩和恒星旋转的速度,也是由X射线辐射判断的活动水平是统计上弱。

英文摘要:

We present Spitzer MIPS observations at 24 um of 37 solar-type stars in the Pleiades and combine them with previous observations to obtain a sample of 71 stars. We report that 23 stars, or 32 +/- 6.8%, have excesses at 24 um at least 10% above their photospheric emission. We compare our results with studies of debris disks in other open clusters and with a study of A stars to show that debris disks around solar-type stars at 115 Myr occur at nearly the same rate as around A-type stars. We analyze the effects of binarity and X-ray activity on the excess flux. Stars with warm excesses tend not to be in equal-mass binary systems, possibly due to clearing of planetesimals by binary companions in similar orbits. We find that the apparent anti-correlations in the incidence of excess and both the rate of stellar rotation and also the level of activity as judged by X-ray emission are statistically weak.

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