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

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)S437-S442
JournalPublications of the Astronomical Society of Japan
Volume59
Issue numberSPEC. ISS. 2
DOIs
Publication statusPublished - 2007
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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