Mamajek 1

Number of stars per data source

	Reference  164 :    1 star
	Reference  192 :    1 star

164: Gronbech B., Olsen E.H.; (1977) Astron. Astrophys. Suppl. 27, 443; Photoelectric Hbeta photometry for bright O to G0 type stars south of declination +10; 1977A&AS...27..443G
192: Eggen O.J.; (1977) Publ. Astron. Soc. Pacific 89, 205; Intermediate-band photometry of early-type stars; 1977PASP...89..205E