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球状星团NGC104和NGC362星周尘埃的AKARI观测

AKARI observations of circumstellar dust in the globular clusters NGC104 and NGC362

Yoshifusa Ita, Toshihiko Tanabe, Noriyuki Matsunaga, Yoshikazu Nakada, Mikako Matsuura, Takashi Onaka, Hideo Matsuhara, Takehiko Wada, Naofumi Fujishiro, Daisuk… 展开作者

Yoshifusa Ita, Toshihiko Tanabe, Noriyuki Matsunaga, Yoshikazu Nakada, Mikako Matsuura, Takashi Onaka, Hideo Matsuhara, Takehiko Wada, Naofumi Fujishiro, Daisuke Ishihara, Hirokazu Kataza, Woojung Kim, Toshio Matsumoto, Hiroshi Murakami, Youichi Ohyama, Fumihiko Usui, Shinki Oyabu, Itsuki Sakon, Toshinobu Takagi, Kazunori Uemizu, Munetaka Ueno, Hidenori Watarai

备注：
Accepted for publication in PASJ
发表信息：
Publ.Astron.Soc.Jap.59:437-442,2007
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摘要：

本文报道了AKARI对两个球状星团NGC 104和NGC 362的初步观测结果。利用2.4、3.2、4.1、7.0、9.0、11.0、15.0、18.0和24.0 μ的红外照相机（IRC）获得了以这两个星团为中心的约10 × 10弧分^2区域的成像数据。我们使用F11/F2和F24/F7通量比作为拱星尘埃排放的诊断。尘埃排放主要来自渐近巨星分支上的变星，但位于第一个上升巨星分支尖端以下的一些变星也显示出尘埃排放。我们在NGC 362中发现了8个F24/F7比值大于1的红色源。八个中有六个没有2 MASS对应物。然而，我们在NGC 104中没有发现这样的源。

英文摘要：

We report preliminary results of AKARI observations of two globular clusters, NGC104 and NGC362. Imaging data covering areas of about 10x10 arcmin^2 centered on the two clusters have been obtained with InfraRed Camera (IRC) at 2.4, 3.2, 4.1, 7.0, 9.0, 11.0, 15.0, 18.0 and 24.0 mu. We used F11/F2 and F24/F7 flux ratios as diagnostics of circumstellar dust emission. Dust emissions are mainly detected from variable stars obviously on the asymptotic giant branch, but some variable stars that reside below the tip of the first-ascending giant branch also show dust emissions. We found eight red sources with F24/F7 ratio greater than unity in NGC362. Six out of the eight have no 2MASS counterparts. However, we found no such source in NGC104.

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