AKARI observations of circumstellar dust in the globular clusters NGC 104 and NGC 362

Yoshifusa Ita; Toshihiko Tanabé; 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

doi:10.1093/pasj/59.sp2.s437

AKARI observations of circumstellar dust in the globular clusters NGC 104 and NGC 362

Yoshifusa Ita, Toshihiko Tanabé, 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 UemizuMunetaka Ueno, Hidenori Watarai

研究成果: Article › 査読

26 被引用数 (Scopus)

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We report on preliminary results of AKARI observations of two globular clusters, NGC 104 and NGC 362. Imaging data covering areas of about 10×10 arcmin² centered on the two clusters were obtained with the Infrared Camera (IRC) at 2.4, 3.2, 4.1, 7.0, 9.0, 11.0, 15.0, 18.0, and 24.0 μm. We used IRC 11.0νm to 2MASS K_s 2 μm flux-density ratio (F ₁₁/F₂) and IRC 24.0 μm to 7.0 μm flux-density ratio (F₂₄/F₇) 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 the F₂₄/F₇ ratio being greater than unity in NGC 362. Six out of the eight have no 2MASS counterparts. However, we found no such source in NGC 104.

本文言語	English
ページ（範囲）	S437-S442
ジャーナル	Publications of the Astronomical Society of Japan
巻	59
号	SPEC. ISS. 2
DOI	https://doi.org/10.1093/pasj/59.sp2.s437
出版ステータス	Published - 2007
外部発表	はい

ASJC Scopus subject areas

天文学と天体物理学
宇宙惑星科学

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10.1093/pasj/59.sp2.s437

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Ita, Y., Tanabé, T., Matsunaga, N., Nakada, Y., Matsuura, M., Onaka, T., Matsuhara, H., Wada, T., Fujishiro, N., Ishihara, D., Kataza, H., Kim, W., Matsumoto, T., Murakami, H., Ohyama, Y., Usui, F., Oyabu, S., Sakon, I., Takagi, T., ... Watarai, H. (2007). AKARI observations of circumstellar dust in the globular clusters NGC 104 and NGC 362. Publications of the Astronomical Society of Japan, 59(SPEC. ISS. 2), S437-S442. https://doi.org/10.1093/pasj/59.sp2.s437

Ita, Y, Tanabé, T, Matsunaga, N, Nakada, Y, Matsuura, M, Onaka, T, Matsuhara, H, Wada, T, Fujishiro, N, Ishihara, D, Kataza, H, Kim, W, Matsumoto, T, Murakami, H, Ohyama, Y, Usui, F, Oyabu, S, Sakon, I, Takagi, T, Uemizu, K, Ueno, M & Watarai, H 2007, 'AKARI observations of circumstellar dust in the globular clusters NGC 104 and NGC 362', Publications of the Astronomical Society of Japan, vol. 59, no. SPEC. ISS. 2, pp. S437-S442. https://doi.org/10.1093/pasj/59.sp2.s437

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title = "AKARI observations of circumstellar dust in the globular clusters NGC 104 and NGC 362",

abstract = "We report on preliminary results of AKARI observations of two globular clusters, NGC 104 and NGC 362. Imaging data covering areas of about 10×10 arcmin2 centered on the two clusters were obtained with the Infrared Camera (IRC) at 2.4, 3.2, 4.1, 7.0, 9.0, 11.0, 15.0, 18.0, and 24.0 μm. We used IRC 11.0νm to 2MASS Ks 2 μm flux-density ratio (F 11/F2) and IRC 24.0 μm to 7.0 μm flux-density ratio (F24/F7) 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 the F24/F7 ratio being greater than unity in NGC 362. Six out of the eight have no 2MASS counterparts. However, we found no such source in NGC 104.",

keywords = "Clusters: individual (NGC 104, NGC 362), Galaxy: globular, Infrared: stars, Stars: AGB and post-AGB",

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

year = "2007",

doi = "10.1093/pasj/59.sp2.s437",

language = "English",

volume = "59",

pages = "S437--S442",

journal = "Publications of the Astronomical Society of Japan",

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T1 - AKARI observations of circumstellar dust in the globular clusters NGC 104 and NGC 362

AU - Ita, Yoshifusa

AU - Tanabé, Toshihiko

AU - Matsunaga, Noriyuki

AU - Nakada, Yoshikazu

AU - Matsuura, Mikako

AU - Onaka, Takashi

AU - Matsuhara, Hideo

AU - Wada, Takehiko

AU - Fujishiro, Naofumi

AU - Ishihara, Daisuke

AU - Kataza, Hirokazu

AU - Kim, Woojung

AU - Matsumoto, Toshio

AU - Murakami, Hiroshi

AU - Ohyama, Youichi

AU - Usui, Fumihiko

AU - Oyabu, Shinki

AU - Sakon, Itsuki

AU - Takagi, Toshinobu

AU - Uemizu, Kazunori

AU - Ueno, Munetaka

AU - Watarai, Hidenori

PY - 2007

Y1 - 2007

N2 - We report on preliminary results of AKARI observations of two globular clusters, NGC 104 and NGC 362. Imaging data covering areas of about 10×10 arcmin2 centered on the two clusters were obtained with the Infrared Camera (IRC) at 2.4, 3.2, 4.1, 7.0, 9.0, 11.0, 15.0, 18.0, and 24.0 μm. We used IRC 11.0νm to 2MASS Ks 2 μm flux-density ratio (F 11/F2) and IRC 24.0 μm to 7.0 μm flux-density ratio (F24/F7) 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 the F24/F7 ratio being greater than unity in NGC 362. Six out of the eight have no 2MASS counterparts. However, we found no such source in NGC 104.

AB - We report on preliminary results of AKARI observations of two globular clusters, NGC 104 and NGC 362. Imaging data covering areas of about 10×10 arcmin2 centered on the two clusters were obtained with the Infrared Camera (IRC) at 2.4, 3.2, 4.1, 7.0, 9.0, 11.0, 15.0, 18.0, and 24.0 μm. We used IRC 11.0νm to 2MASS Ks 2 μm flux-density ratio (F 11/F2) and IRC 24.0 μm to 7.0 μm flux-density ratio (F24/F7) 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 the F24/F7 ratio being greater than unity in NGC 362. Six out of the eight have no 2MASS counterparts. However, we found no such source in NGC 104.

KW - Clusters: individual (NGC 104, NGC 362)

KW - Galaxy: globular

KW - Infrared: stars

KW - Stars: AGB and post-AGB

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DO - 10.1093/pasj/59.sp2.s437

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AN - SCOPUS:36849069035

VL - 59

SP - S437-S442

JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

SN - 0004-6264

IS - SPEC. ISS. 2

ER -

AKARI observations of circumstellar dust in the globular clusters NGC 104 and NGC 362

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