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Table 1

Classification of the AKARI/MIR catalogue sources.

Group Representative population Number of members
(Definition in SIMBADa)  [J]  −  [K]  vs.  [K]  −  [9]   [K]  −  [9]  vs.  [9]  −  [18]   [J]  −  [K]  vs.  [9]  −  [18] 
knownb totalc knownb totalc knownb totalc

A YSOs (YSO, TT∗, HII) 1, 302 81, 802 776 17, 369 776 5, 588
B Emission line stars (Be∗, Em∗, WR∗) 1, 984 1, 644 744 -d 744 1,493
C Normal stars (O–M dwarfs & giants;  ∗) 167, 829 288, 597 35, 117 36, 906 35, 117 27, 836
D S-stars (S∗) 852 205, 255 461 17, 454 461 20, 973
E C-rich AGBs (C∗) 5, 197 202, 252 3, 037 13, 944 3, 037 18, 596
F O-rich AGBs (OH∗, AB∗) 1, 193 30, 711 745 71, 190 745 83, 012
G Post-AGBs & PNe (pA∗, PN) 836 6, 858 670 1, 762 670 2, 076
H Galaxies (G, EmG, H2G, rG, LSB, 1, 323 2, 735 744 3, 977 744 3, 028
LIN, Sy2, Sy1, AGN, SyG)

Notes. 

(a)

Abbreviated expressions for object types used in the SIMBAD database. We assign ambiguous objects to each class. For example, the objects labeled as C∗? (carbon star candidate) are included in group E.

(b)

The number of known objects in the SIMBAD database.

(c)

The number of objects in the occupation zone defined in this work.

(d)

Emission-line stars cannot be separated clearly on the  [K]  −  [9]  vs.  [9]  −  [18]  diagram.

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