NGC 6664

Number of stars per data source

	Reference  221 :    2 stars
	Reference  532 :    9 stars

References

 221
Sowell J.R
(1987) Astrophys. J. Suppl. 64, 241
Yellow evolved stars in open clusters
1987ApJS...64..241S
 532
Walker M.F., Bidelman W.P.
(1960) Publ. Astr. Soc. Pacific 72, 50
The reddest giants in M11 and NGC 7789
1960PASP...72...50W