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Fig. 8


Spatial distributions of the C-rich and O-rich AGB stars projected onto the Galactic plane viewed from the north pole: a) C-rich AGBs at |b| ≤ 10°, b) C-rich AGBs at |b| > 10°, c) O-rich AGBs at |b| ≤ 10°, and d) O-rich AGBs at |b| > 10°. The red dots indicate the purified samples. The contours in panels a) and c) show the areal densities for the purified samples (i.e. densities of red points). The levels of the contours are 10, 20, and 30 kpc-2 for panel a), and 10, 50, and 100 kpc-2 for panel c). The distance scale for each object is estimated from the AKARI 9 μm fluxes and  [K]  −  [9]  colors (see Sect. 3). The Sun is located at the origin. The G.C. is to the right of the Sun and shown by the cross at (X,Y) = (8.5,0). The dotted squares in b) and d) indicate the size of a) and c). Note that the scale of the distance used in panels b) and d) is a factor of two larger than that in panels a) and c).

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