NGC 3680
Number of stars per data source
Reference 21 : 14 stars
References
- 21
- Eggen O.J.
- (1983) Astron. J. 88, 813
- Calibrations of the reddening, luminosity, and abundance of old disk giants from photometry of stars in M67, NGC 3680, NGC 2420, and the Wolf 630 and Arcturus groups
- 1983AJ.....88..813E