Mid-Infrared Imaging of Candidate Vega-like Systems
Mid-Infrared Imaging of Candidate Vega-like Systems
复制标题
候选类织女星系统的中红外成像
DOI：
10.1086/322092
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
G. Fazio
中科院分区：
文献类型：
--
作者：
R. Jayawardhana;R. Fisher;C. Telesco;R. Piña;D. Barrado y Navascués;L. Hartmann;G. Fazio
我们使用托洛洛山美洲天文台 4 m 和凯克 II 10 m 望远镜上的 OSCIR 仪器，对相对较近的候选织女星样本进行了深中红外成像。 Jayawardhana 等人已于 1998 年报道了我们在 HR 4796A 周围发现的空间分辨圆盘。在这里，我们展示了对该样本其他成员的成像观测，包括发现只有 HD 35187 双星系统中的主星似乎拥有一个巨大的星周盘，以及可能检测到在鲸鱼座 49 周围扩展的盘发射。我们推导出尘盘的全局属性，对其尺寸施加限制，并详细讨论几个有趣的案例。尽管我们的目标被认为是主序星，但我们注意到，与原型类织女星系统相比，其中一些恒星具有较大的红外过剩，因此可能更年轻。在许多情况下，我们得出的圆盘尺寸限制意味着中红外波长处相对较大（≳10μm）粒子的发射。
We have conducted deep mid-infrared imaging of a relatively nearby sample of candidate Vega-like stars using the OSCIR instrument on the Cerro Tololo Inter-American Observatory 4 m and Keck II 10 m telescopes. Our discovery of a spatially resolved disk around HR 4796A has already been reported in 1998 by Jayawardhana et al. Here we present imaging observations of the other members of the sample, including the discovery that only the primary in the HD 35187 binary system appears to harbor a substantial circumstellar disk and the possible detection of extended disk emission around 49 Ceti. We derive global properties of the dust disks, place constraints on their sizes, and discuss several interesting cases in detail. Although our targets are believed to be main-sequence stars, we note that several have large infrared excesses compared with prototype Vega-like systems and may therefore be somewhat younger. The disk size constraints we derive, in many cases, imply emission from relatively large (≳10 μm) particles at mid-infrared wavelengths.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell