AKARI's infrared view on nearby stars : Using AKARI Infrared Camera All-Sky Survey, 2MASS, and Hipparcos catalog

Abstract

Results: We found that the (B-V) v.s. (V-S9W) color-color diagram is useful to identify the stars with infrared excess emerged from circumstellar envelopes/disks. Be stars with infrared excess are well separated from other types of stars in this diagram. Whereas (J-L18W) v.s. (S9W-L18W) diagram is a powerful tool to classify several object-types. Carbon-rich asymptotic giant branch (AGB) stars and OH/IR stars form distinct sequences in this color-color diagram. Young stellar objects (YSOs), pre-main sequence (PMS) stars, post-AGB stars and planetary nebulae (PNe) have largest mid-infrared color-excess, and can be identified in infrared catalog. Finally, we plot L18W v.s. (S9W-L18W) color-magnitude diagram, using the AKARI data together with Hipparcos parallaxes. This diagram can be used to identify low-mass YSOs, as well as AGB stars. We found that this diagram is comparable to the [24] vs ([8.0]-[24]) diagram of Large Magellanic Cloud sources using the Spitzer Space Telescope data. Our understanding of Galactic objects will be used to interpret color-magnitude diagram of stellar populations in nearby galaxies which Spitzer Space Telescope has observed. Conclusions: Our study of the AKARI color-color and color-magnitude will be used to explore properties of unknown objects in future. In addition, our analysis highlights a future key project to understand stellar evolution with circumstellar envelope, once the forthcoming astronometrical data with GAIA are available.

arXiv comment14 pages, 11 figures, accepted for publication in A&A. High resolution version is available at: http://www.ir.isas.jaxa.jp/%7Eyita/allsky20100302.pdf (26Mb)

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Cited by in corpus (12)

• The AKARI/IRC Mid-Infrared All-Sky Survey
• Fundamental parameters and infrared excesses of Hipparcos stars
• The Infrared Continuum Sizes of Be Star Disks
• Galactic distributions of carbon- and oxygen-rich AGB stars revealed by the AKARI mid-infrared all-sky survey
• Ultraviolet emission from main-sequence companions of AGB stars
• Discovery of carbon-rich Miras in the Galactic bulge
• Simultaneous spectral energy distribution and near-infrared interferometry modeling of HD 142666
• Distinguishing post-AGB impostors in a sample of pre-main sequence stars
• Long-term Stellar Variability in the Galactic Centre Region
• Quiescent and active phases in Be stars: A WISE snapshot of young galactic open clusters
• Slow-scan Observations with the Infrared Camera (IRC) on-board AKARI
• Infrared properties of Active OB stars in the Magellanic Clouds from the Spitzer SAGE Survey