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AKARI IRC survey of the Large Magellanic Cloud: A new feature in the infrared color—magnitude diagram

Published online by Cambridge University Press:  01 July 2008

Yoshifusa Ita ,
Takashi Onaka  and
Daisuke Kato
Yoshifusa Ita
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan email: [email protected]
Takashi Onaka
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Daisuke Kato
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
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Abstract

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We observed an area of 10 deg2 of the Large Magellanic Cloud using the Infrared Camera on board AKARI. The observations were carried out using five imaging filters (3, 7, 11, 15, and 24 μm) and a dispersion prism (2 − 5 μm, λ/Δλ ~ 20) equipped in the IRC. The 11 and 15 μm data, which are unique to AKARI IRC, allow us to construct color-magnitude diagrams that are useful to identify stars with circumstellar dust. We found a new sequence in the color-magnitude diagram, which is attributed to red giants with luminosity fainter than that of the tip of the first red giant branch. We suggest that this sequence is likely to be related to the broad emission feature of aluminium oxide at 11.5 μm.

Keywords

stars: AGB and post-AGBcircumstellar matterstars: mass lossgalaxies: individual (LMC)Magellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S256: The Magellanic System: Stars, Gas, and Galaxies , July 2008 , pp. 9 - 13
Copyright
Copyright © International Astronomical Union 2009

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