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