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