A Spitzer View of Protoplanetary Disks in the γ Velorum Cluster-猫眼课题宝

DOI：

10.1086/591224

发表时间：

2008-06

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

J. Hernández;L. Hartmann;N. Calvet;R. Jeffries;R. Gutermuth;J. Muzerolle;J. I. O. Astronomy;U. Michigan;Ann Arbor;Mi;US Centro de Investigaciones de Astronomia-US-Centro-de-Investigaciones-de-Astronomia-2264414383;Merida;Venezuela Astrophysics Group;K. University;Keele;S. C. M. F. Astrophysics;Ma;Usa Steward Observatory;U. Arizona;Tucson;Az;Usa Herschel Science Center;Pasadena;Ca;US.

我们介绍了斯皮策太空望远镜对年轻（~ 500万年）的γ Velorum星团中恒星的新观测。结合光学和2 MASS测光，我们已经选择了579颗恒星作为候选成员的集群。加上斯皮策的中红外数据，我们已经确定了A型星周围的5个碎片盘和5到6个太阳型星周围的碎片盘，这表明星团中的强辐射场并没有完全抑制星团成员盘中星子的产生。然而，我们发现一些证据表明，拱星原始磁盘的频率较低，红外线通量过剩小于磁盘周围的恒星人口具有类似的年龄。这可能是星团中质量最大的星星的强辐射场导致星周尘埃相对快速消散的证据。另一种可能性是γ Velorum恒星团比报道的年龄稍老，原始盘的低频率反映了在~5 Myr时观察到的快速盘消散。

We present new Spitzer Space Telescope observations of stars in the young (~5 Myr) γ Velorum stellar cluster. Combining optical and 2MASS photometry, we have selected 579 stars as candidate members of the cluster. With the addition of the Spitzer mid-infrared data, we have identified five debris disks around A-type stars and five to six debris disks around solar-type stars, indicating that the strong radiation field in the cluster does not completely suppress the production of planetesimals in the disks of cluster members. However, we find some evidence that the frequency of circumstellar primordial disks is lower, and the infrared flux excesses are smaller than for disks around stellar populations with similar ages. This could be evidence for a relatively fast dissipation of circumstellar dust by the strong radiation field from the highest mass star(s) in the cluster. Another possibility is that γ Velorum stellar cluster is slightly older than reported ages and the low frequency of primordial disks reflects the fast disk dissipation observed at ~5 Myr.

A Spitzer View of Protoplanetary Disks in the γ Velorum Cluster

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