| sides of the major axis. These arms were also studied by Baade in 1963 (Evolution of stars and galaxies). | |
| in source: | M 31 = NGC 224 |
| Ref: | =1964ApJ...139.1045A |
| by | ARP H.C. |
| Astrophys. J., 139, 1045-1057 (1964) | |
| Spiral structure in M 31. | |
| o | <NAME Arm W N in M 31> (Nos N 1 to N 7) and (Nos S 1 to S 7) |
====Sorry, no entry could be found==== | |