NGC 6531

Number of stars per data source

	Reference    1 :    3 stars
	Reference    4 :   21 stars
	Reference   16 :    2 stars
	Reference   33 :    6 stars
	Reference   71 :   24 stars
	Reference   98 :    4 stars

References

 1

Egret D.

(1986) Private Communication

Coordinates from SIMBAD (mainly SAO)

 4

Hoag A.A., Johnson H.L., Iriarte B., Mitchell R.I., Hallam K.L., Sharpless S.

(1961) Publ. Us. Nav. Obs. XVII part VII, 347

Photometry of stars in galactic cluster fields

 16

Stephenson C.B., Sanduleak N.

(1971) Publ. Warner Swasey Obs. 1 no 1

Luminous stars in the southern Milky Way

 33

Egret D.

(1986) Private communication

Coordinates from SIMBAD (other than SAO)

 71

Mermilliod J.-C.

(1988)

Positions measured with the Hipad tablet

 98

Tucholke H.-J.

(1989) Astron. Astrophys. Suppl. 78, 187

Positions of southern open cluster stars proposed for the Hipparcos mission

1989A&AS...78..187B