NGC 457

Number of stars per data source

	Reference   16 :    1 star
	Reference   20 :    1 star
	Reference  206 :    4 stars
	Reference  207 :    3 stars
	Reference  221 :    3 stars
	Reference  222 :    1 star
	Reference  268 :    1 star
	Reference  582 :    1 star
	Reference  863 :    1 star
	Reference  980 :    1 star

References

16: Nassau J.J., Morgan W.W.; (1952) Astrophys. J. 115, 475; A finding list of F stars of high luminosity; 1952ApJ...115..475N
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
221: Sowell J.R; (1987) Astrophys. J. Suppl. 64, 241; Yellow evolved stars in open clusters; 1987ApJS...64..241S
222: Abt H.A., Morrell N.I.; (1995) Astrophys. J. Suppl. 99, 135; The relation between rotational velocities and spectral peculiarities among A-type stars; 1995ApJS...99..135A
268: Humphreys R.M.; (1970) Astron. J. 75, 602; The space distribution and kinematics of supergiants; 1970AJ.....75..602H
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
863: Bouigue M.R.; (1960) Publ. Obs. Haute-Provence 4 no 52; Contribution aux recherches de photometrie photoelectrique dans la Galaxie. I - V.
980: Morgan, W.W., Keenan, P.C., Kellman, E.; (1943) An Atlas of Stellar Spectra. Chicago Univ. Press