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

Ita, Yoshifusa, Tanabé, Toshihiko, Matsunaga, Noriyuki, Nakada, Yoshikazu, Matsuura, Mikako ORCID: https://orcid.org/0000-0002-5529-5593, Onaka, Takashi, Matsuhara, Hideo, Wada, Takehiko, Fujishiro, Naofumi, Ishihara, Daisuke, Kataza, Hirokazu, Kim, Woojung, Matsumoto, Toshio, Murakami, Hiroshi, Ohyama, Youichi, Usui, Fumihiko, Oyabu, Shinki, Sakon, Itsuki, Takagi, Toshinobu, Uemizu, Kazunori, Ueno, Munetaka and Watarai, Hidenori 2007. AKARI observations of circumstellar dust in the globular clusters NGC 104 and NGC 362. Publications of Astronomical Society of Japan 59 (sp2) , S437–S442. 10.1093/pasj/59.sp2.S437

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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 x 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 11.0 μm to 2 MASS Ks 2 μm flux-density ratio (⁠F11/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 2 MASS counterparts. However, we found no such source in NGC 104.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Oxford University Press
ISSN:	0004-6264
Date of Acceptance:	7 April 2007
Last Modified:	08 May 2024 09:00
URI:	https://orca.cardiff.ac.uk/id/eprint/168130

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