NGC 2506
Number of stars per data source
Reference 7 : 10 stars
References
- 7
- Houdashelt M.L., Frogel J.A., Cohen J.G.
- (1992) Astron. J. 103, 163
- Giants in old open clusters: temperature, luminosities, and abundances from infrared photometry
- 1992AJ....103..163H