C 6822 is studied in 3 fields 'a' (Nos a-c) M 31 is studied in several 'obNNN' fields (obNNN = [V64] NNN in SIMBAD) M 33 is studied in fields (Nos a-g, x). There are 3 control fields: N6Con, SA 45a and SA 45b. See also [MJ98]in source:NGC 6822in source:M 31 = NGC 224in source:M 33 = NGC 598Ref:=1998ApJ...501..153M
Astrophys. J., 501, 153-174 (1998)
Evolved massive stars in the local group. I. Identification of red supergiants in NGC 6822, M31, and M33.
oTable 2: <[M98a] NGC 6822a-NNNN> N=220, <[M98a] M 33a-NNNN> N=417, <[M98a] M 31obNNN-NNNN> N=199, <[M98a] N6Con-NNN> N=34, <[M98a] SA 45a-NN> N=21.
=E=Catalogue in electronic form as J/ApJ/501/153 ====Sorry, no entry could be found====