NGC 3680

Number of stars per data source

	Reference  352 :    4 stars
	Reference  420 :    8 stars

352: 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
420: Nissen P.E.; (1988) Astron. Astrophys. 199, 146; The fourth-parameter problem in uvby-beta: photometry of open clusters; 1988A&A...199..146N