Hogg 18

Number of stars per data source

	Reference  190 :    1 star
	Reference  261 :    1 star
	Reference  470 :    1 star

190: Klare G., Neckel T.; (1977) Astron. Astrophys. Suppl. 27, 215; UBV Hbeta and polarization measurements of 1660 southern OB stars; 1977A&AS...27..215K
261: Kilkenny D.; (1981) Mon. Not. R. Astron. Soc. 194, 927; Hbeta photometry of southern early-type stars; 1981MNRAS.194..927K
470: Knude J.; (1992) Astron. Astrophys. Suppl. 92, 841; uvby Beta observations of 528 type B stars with V between the 8th and 9th magnitude; 1992A&AS...92..841K