NGC 188

Number of stars per data source

	Reference   82 :  167 stars
	Reference  109 :   10 stars
	Reference  578 :   14 stars

82: Eggen O.J., Sandage A.R.; (1969) Astrophys. J. 158, 669; New photometric data for the old galactic cluster NGC 188: the presence of a gap, chemical composition, and distance modulus; 1969ApJ...158..669E
109: McClure R.D.; (1974) Astrophys. J. 194, 355; Possible abundance difference among giant stars in NGC 188; 1974ApJ...194..355M
578: Jennens P.A., Helfer H.L.; (1975) Monthly Notices Roy. Astron. Soc. 172, 681; Photometric metal abundances for twenty clusters; 1975MNRAS.172..681J