NGC 6530

Number of stars per data source

	Reference   41 :    1 star
	Reference   74 :    1 star
	Reference  114 :    2 stars
	Reference  137 :    2 stars

41: Crawford D.L., Barnes J.V., Golson J.C.; (1971) Astron. J. 76, 621; Four-color and Hbeta photometry for bright B-type stars in the southern hemisphere; 1971AJ.....76..621C
74: Danziger I.J., Faber S.M.; (1971) Astron. Astrophys. 18, 428; Rotation of evolving A and F stars; 1971A&A....18..428D
114: Morrison N.D.; (1975) Astrophys. J. 200,113; Photometry of O-type stars,interpreted with reference to model atmospheres; 1975ApJ...200..113M
137: Gronbech B., Olsen E.H.; (1976) Astron. Astrophys. Suppl. 25, 213; Four colour uvby photometry for bright O to G0 type stars south of declination +10; 1976A&AS...25..213G