Berkeley 31
Number of stars per data source
Reference 60 : 699 stars
Reference 88 : 1933 stars
Reference 389 : 193 stars
References
- 60
- Guetter H.H.
- (1993) Astron. J. 106, 220
- Photometric study of the old galactic cluster Be31
- 1993AJ....106..220G
- 88
- Phelps R.L., Janes K.A., Montgomery K.A.
- (1994) Astron. J. 107, 1079
- Development of the galactic disk: a search for the oldest open clusters
- 1994AJ....107.1079P
- 389
- Hasegawa T., Malasan H.L., Kawakita H., Obayashi H., Kurabayashi T., Nakai T., Hyakkai M., Arimoto N.
- (2004) Publ. Astron. Soc. Japan 56, 295
- New photometric data of old open clusters in the anti-galactic center region
- 2004PASJ...56..295H