NGC 457

Number of stars per data source

	Reference   20 :    1 star
	Reference  206 :    4 stars
	Reference  207 :    3 stars
	Reference  582 :    1 star

References

 20
Johnson H.L., Morgan W.W.
(1953) Astrophys. J. 117, 313
Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes Spectral Atlas
1953ApJ...117..313J
 206
Hiltner W.A.
(1956) Astrophys. J. Suppl. 2, 389
Photometric, polarization and spectrographic observations of O and B stars
1956ApJS....2..389H
 207
Hoag A.A., Applequist L.
(1965) Astrophys. J. Suppl. 12, 215
Distance moduli of open clusters
1965ApJS...12..215H
 582
Keenan P.C., Pitts R.E.
(1985) Publ. Astr. Soc. Pacific 97, 297
Spectral types and luminosities of supergiants in open clusters
1985PASP...97..297K