NGC 225

Number of stars per data source

	Reference   64 :   12 stars
	Reference  221 :    2 stars
	Reference  309 :   14 stars
	Reference  320 :    2 stars

64: Svolopoulos S.N.; (1962) Astrophys. J. 136, 788; Spectral classifications in nine open clusters; 1962ApJ...136..788S
221: Sowell J.R; (1987) Astrophys. J. Suppl. 64, 241; Yellow evolved stars in open clusters; 1987ApJS...64..241S
309: Lattanzi M.G., Massone G., Munari U.; (1991) Astron. J. 102, 177; Memberships and CM diagrams of young open clusters: I. NGC 225; 1991AJ....102..177L
320: Sears R.L., Sowell J.R.; (1997) Astron. J. 113, 1039; Spectral classification of "photometric subgiants" in open clusters; 1997AJ....113.1039S