NGC 6231

Number of stars per data source

	Reference  170 :   82 stars
	Reference  172 :  849 stars
	Reference  218 :  975 stars

170: Piatti A.E., Claria J.J., Bica E.; (1998) Astrophys. J. Suppl. 116, 263; Composite Mv vs (V-I)o diagram for template open clusters
172: Sung H., Bessell M.S., Lee s.-W.; (1998) Astron. J. 115, 734; UBVRI Halpha photometry of the young open cluster NGC 6231; 1998AJ....115..734S
218: Baume G., Vazquez R.A., Feinstein A.; (1999) Astron. Astrophys. Suppl. 137, 233; UBVI imaging photometry of NGC 6231; 1999A&AS..137..233B