TY - JOUR
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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U2 - 10.1093/pasj/59.sp2.s437
DO - 10.1093/pasj/59.sp2.s437
M3 - Article
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 -