Spitzer 24 μm Observations of Open Cluster IC 2391 and Debris Disk Evolution of FGK Stars
Spitzer 24 μm Observations of Open Cluster IC 2391 and Debris Disk Evolution of FGK Stars
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Spitzer 24 μm 疏散星团 IC 2391 观测和 FGK 恒星碎片盘演化
DOI：
10.1086/509042
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
K. Su
中科院分区：
文献类型：
--
作者：
N. Siegler;J. Muzerolle;E. Young;G. Rieke;E. Mamajek;D. Trilling;N. Gorlova;K. Su
本文报道了对5000万年前疏散星团IC 2391的24 μm Spitzer MIPS测光观测结果。在星系团的中心方度观测到34个光谱类型从B3到M5的星系团成员。在一颗A型星星、六颗FGK型恒星和可能的一颗M型矮星周围发现了过多的碎片盘。对于观察到的星团成员的光球极限，我们发现一个碎片盘的频率为10%的B-A星和31%的FGK星使用15%的相对过剩阈值。相对于一个衰减的过剩频率的模型，A型恒星周围的碎片盘的频率似乎略低的集群的年龄，而FGK星似乎一致。可以定性地解释这一结果的情况进行了检查。我们的结论是，在FGK恒星的陆地区域的星子活动是常见的第一个~50万年和衰减的时间尺度上~100万年。尽管光度的差异，碎片盘的演变似乎并不强烈依赖于恒星质量。
We present 24 μm Spitzer MIPS photometric observations of the ~50 Myr open cluster IC 2391. Thirty-four cluster members ranging in spectral type from B3 to M5 were observed in the central square degree of the cluster. Excesses indicative of debris disks were discovered around one A star, six FGK stars, and possibly one M dwarf. For the cluster members observed to their photospheric limit, we find a debris disk frequency of 10% for B-A stars and 31% for FGK stars using a 15% relative excess threshold. Relative to a model of decaying excess frequency, the frequency of debris disks around A-type stars appears marginally low for the cluster's age while that of FGK stars appears consistent. Scenarios that may qualitatively explain this result are examined. We conclude that planetesimal activity in the terrestrial region of FGK stars is common in the first ~50 Myr and decays on timescales of ~100 Myr. Despite luminosity differences, debris disk evolution does not appear to depend strongly on stellar mass.
影响因子：
64.8
作者：
Kleine, T;Münker, C;Palme, H
通讯作者：
Palme, H