NGC 457

Number of stars per data source

	Reference    1 :    1 star
	Reference   34 :    1 star
	Reference  345 :    1 star
	Reference  424 :    1 star
	Reference  452 :    1 star

1: Stromgren B., Perry C.L.; (1965) Astron. J. 71, 709; Institute for Advanced Study, Princeton, N. J. second version, unpublished Crawford D.L., Barnes J.V., Faure B.Q., Golson J.C. Photoelectric Hbeta photometry for 1217 stars brighter than V = 6.5 mag; 1965AJ.....71..709
34: Williams J.A.; (1966) Astron. J. 71, 615; Metal-to-hydrogen ratio in the galaxy as indicated by narrow-band photometry of cepheids; 1966AJ.....71..615W
345: Olsen E.H.; (1983) Astron. Astrophys. Suppl. 54, 55; Four-colour ubvy and Hbeta photometry of A5 to G0 stars brighter than 8.3m; 1983A&AS...54...55O
424: Arellano Ferro A., Parrao L., Giridhar S.; (1988) Publ. Astron. Soc. Pacific 100, 993; Comments on the variability and physical parameters of the F supergiant Phi Cassiopeiae; 1988PASP..100..993A
452: Ferro A.A., Parrao L., Schuster W., Gonzalez-Bedolla S., Peniche R., Pena J.H.; (1990) Astron. Astrophys. Suppl. 83, 225; An uvby Beta catalogue of FO-KO supergiant stars brighter than V=6.5; 1990A&AS...83..225F