A High Sensitivity Exploration of the Distribution of Circumstellar Dust in Optical Light based on the Development of a Stellar Coronagraph

基于恒星日冕仪研制的可见光下星周尘埃分布的高灵敏度探索

• 批准号: 17540221
• 负责人: IZUMIURA Hideyuki
• 金额: $ 2.27万
• 依托单位: National Astronomical Observatory of Japan
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17540221/
• 关键词: stars; coronagraph; circumstellar; dust shells; scattered light; mass-loss; red giants

This study aims at detecting and exploring the circumstellar dust shells of bright red giant stars in faint scattered optical light by dust grains with an unprecedented sensitivity. We investigate the time variability and geometry of mass様oss in red giants on the basis of observed dust distribution revealed by the scattered optical light. For this purpose we use existing observing facilities at first hand, while we develop a new coronagraph which will be dedicated to this study. With the coronagraph we will search bright red giants in the optical for their extended dust shells produced by their mass様oss systematically. We intend to depict their dust shells far out into a region beyond 0.1 pc from the central stars as two dimensional images. From the analysis of the structure we learn the history of mass様oss into unprecedented details. We have used Kiso Observatory that belongs to the Institute of Astronomy, The University of Tokyo as our observations with existing facilities. We have detected a circular dust shell with 120" radius of which brightness is about 25^<th> magnitude per square arcseconds in U Hya. We have monitored the brightness of the shell for 4 months but we have not found any significant variability. Furthermore, we have obtained a possible micro structure in the shell. It should be related to a variability or asymmetry of mass様oss, worthy for a further scrutiny. We have also developed a coronagraph equipped with a focal plane mask and a pupil plane mask.. We have installed it to the 115cm reflector at Rikubetsu Space and Earth Science Museum and performed the first observations. As expected, ghost and scattered light in the optics are well suppressed and we can get least affected images, In particular, we are able to detect the dust shell of U Hya in R-band relatively easily, which confirms the effectiveness of R-band in our dust shell survey. We decide to begin with R band for our survey with the coronagraph.

这项研究旨在探测和探索明亮的红巨星在尘埃颗粒以前所未有的灵敏度散射的微弱光学光中的星际尘埃壳。根据观测到的散射光揭示的尘埃分布，我们研究了红巨星中质量様OSS的时间变异性和几何特性。为此，我们使用现有的第一手观测设备，同时我们开发了一种新的日冕仪，将专门用于这项研究。利用日冕仪，我们将在光学系统中搜索亮红色巨星，寻找它们的质量様OSS产生的延展尘埃壳。我们打算将它们的尘埃壳描绘成二维图像，这些尘埃壳距离中心恒星的距离超过0.1pc。从结构的分析中，我们可以了解到海量様操作系统的历史进入了前所未有的细节。我们使用东京大学天文研究所的KISO天文台作为我们现有设施的观测。我们在U Hya观测到了一个半径为120“的圆形尘埃壳，其亮度约为每平方弧秒25量级。我们已经对贝壳的亮度进行了4个月的监测，但没有发现任何显着的变化。此外，我们还得到了壳层中可能的微观结构。这应该与大量様操作系统的可变性或不对称性有关，值得进一步研究。我们还研制了一台配备焦平面面罩和光瞳平面面罩的日冕仪。我们已经把它安装在陆北町空间和地球科学博物馆的115厘米反射镜上，并进行了第一次观测。不出所料，光学系统中的鬼光和散射光得到了很好的抑制，可以得到受影响最小的图像，特别是我们能够在R波段相对容易地探测到U Hya的尘埃壳，这证实了R波段在尘埃壳探测中的有效性。我们决定从R波段开始使用日冕仪进行调查。

项目成果

Detection of a Far-Infrared Bow-Shock Nebula Around the First MIRIAD Results

第一个 MIRIAD 结果周围远红外弓激波星云的探测

• 发表时间: 2006
• 期刊: The Astrophsical Journal Letters 648
• 作者: Ueta;T;Speak;A.K.;Stencel;R.E.;Herwing;F;Gehrz;R.D.;Szczerba;R.;Izumiura;H;Zijlstra;A.A.;Latter;W.B.;Matsuura;M.;Meixner;M.;Steffen;M.;Elitzur,M.
• 通讯作者: Elitzur,M.

Detection of an 0.1 pc Dust Shell of the Carbon star U Hydrae in Optical Light

在可见光下检测碳星 U Hydrae 的 0.1 pc 尘埃壳

• 发表时间: 2007
• 期刊: ASP Conference Series 378
• 作者: Izumiura;H.;Nakada;Y.;Hashimoto;O.;Mito;H.;Hayashi;T.
• 通讯作者: T.

Observation of globular clusters with the infrared astronomy satellite AKARIII

红外天文卫星AKARIII对球状星团的观测

• 发表时间: 2008
• 作者: Hiroyuki Mito;Noriyuki Matsunaga;Yoshikazu Nakada;Hinako Fukushi;Toshihiko Tanabe;Yoshifusa Ita;Hideyuki Izumiura;Mikako Matsuuura;Toshiya Ueta;Issei Yamamura
• 通讯作者: Issei Yamamura

高感度/高分散分光スペクトルに基づくハロ-惑星状星雲の元素組成解析

基于高灵敏度/高色散光谱的晕行星状星云元素成分分析

• 发表时间: 2007
• 作者: 大塚雅昭;田實晃人;泉浦秀行;Siek Hyung
• 通讯作者: Siek Hyung

「あかり」で探る球状星団内星間ダスト

与 AKARI 一起探索球状星团中的星际尘埃

• 发表时间: 2008
• 作者: 松永典之;三戸洋之;中田好-;福士比奈子;田辺俊彦;板由房;泉浦秀行;松浦美香子;植田稔也;山村一誠
• 通讯作者: 山村一誠