Deceased
Deceased
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DOI：
10.1111/j.1752-7325.1955.tb01559.x
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发表时间：
1931
期刊：
影响因子：
--
通讯作者：
A. J. Martinez
中科院分区：
文献类型：
--
作者：
JψφK at Babar;B. Aubert;M. Bona;Y. Karyotakis;J. Lees;V. Poireau;E. Prencipe;X. Prudent;V. Tisserand;M. Barrett;A. Khan;V. Blinov;A. Bukin;A. Buzykaev;V. Druzhinin;V. Golubev;A. Onuchin;S. Serednyakov;Y. Skovpen;E. Solodov;K. Yu;M. Bondioli;S. Curry;I. Eschrich;D. Kirkby;A. Lankford;P. Lund;M. Mandelkern;E. Martin;D. Stoker;C. Flacco;C. Heusch;J. Kroseberg;W. Lockman;A. J. Martinez
我们介绍了使用NASA红外望远镜设施和英国红外望远镜的两个中红外相机(MIRAC2和Berkcam)对66个原始行星星云候选进行的中红外成像调查的数据。这项调查的目标是确定中红外发射区的大小、通量和形态，这些发射区对原行星星云的星际尘埃壳的内部区域进行采样。我们用窄带滤光片(∆λ/λ∼10%)拍摄了这些原始行星星云的图像，其波长具有显著的尘埃特征。在我们的典型角度分辨率为1的情况下，我们解析了17个震源，发现了48个未解析的对象，并且没有检测到1个震源。对于几个信号源，我们检查了这些信号源的光学和红外关联及其位置。我们以表格的形式列出了所有探测到的天体的大小和通量测量值，并显示了所有解析的源的图形。所有探测到的物体的图像都可以从国家超级计算应用中心的天文数字图像库获得FITS格式的在线图像。原始行星状星云的候选样本除了主要的原始行星状星云外，还包括极端渐近的巨型分支恒星、年轻的行星状星云、超巨星和一颗发光的蓝色变星。我们发现，较冷的尘埃壳(T∼150K)和在红外中较亮的尘埃壳更容易分解。在17个可分辨的源中，有11个是扩展的，属于中IR形态的两种类型之一：核/椭圆形或环状。核心/椭圆结构显示未分解的核心，表面亮度较低的椭圆形星云。环状结构显示出肢体明亮的峰值，表明赤道密度增强。我们认为，核心/椭圆形的尘埃壳比环面的尘埃壳更致密。
We present the data from a mid-infrared imaging survey of 66 proto-planetary nebula candidates using two mid-IR cameras (MIRAC2 and Berkcam) at the NASA Infrared Telescope Facility and the United Kingdom Infrared Telescope. The goal of this survey is to determine the size, flux, and morphology of the mid-IR emission regions, which sample the inner regions of the circumstellar dust shells of proto-planetary nebulae. We imaged these proto-planetary nebulae with narrow-band filters (∆λ/λ ∼ 10%) at wavelengths of notable dust features. With our typical angular resolution of 1, we resolve 17 sources, find 48 objects unresolved, and do not detect 1 source. For several sources, we checked optical and infrared associations and positions of the sources. In table format, we list the size and flux measurements for all the detected objects and show figures of all the resolved sources. Images for all the detected objects are available on line in FITS format from the Astronomy Digital Image Library at the National Center for Supercomputing Application. The proto-planetary nebula candidate sample includes, in addition to the predominant proto-planetary nebulae, extreme asymptotic giant branch stars, young planetary nebulae, a supergiant, and a luminous blue variable. We find that dust shells which are cooler (T ∼ 150 K) and brighter in the infrared are more easily resolved. Eleven of the seventeen resolved sources are extended and fall into one of two types of mid-IR morphological classes: core/elliptical or toroidal. Core/elliptical structures show unresolved cores with lower surface brightness elliptical nebulae. Toroidal structures show limb-brightened peaks suggesting equatorial density enhancements. We argue that core/ellipticals have denser dust shells than toroidals.