NGC 581
Number of stars per data source
Reference 113 : 2 stars
Reference 206 : 1 star
Reference 207 : 4 stars
Reference 427 : 1 star
Reference 582 : 1 star
References
- 113
- Abt H.A.
- (1988) Astrophys. J. 331, 922
- Maximum separations among cataloged binaries
- 1988ApJ...331..922A
- 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
- 427
- Jensen K.S.
- (1981) Astron. Astrophys. Suppl. 45, 455
- Spectral classification in the MK system of 167 northern HD stars
- 1981A&AS...45..455J
- 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