NGC 581

Number of stars per data source

	Reference   30 :    1 star
	Reference   43 :    2 stars

References

 30
Meadows A. J.
(1961) Monthly Notices Roy. Astron. Soc. 123, 81
Turbulence and rotation in early-type stars
1961MNRAS.123...81M
 43
Meisel D. D.
(1968) Astron. J. 73, 350
Studies of visual double stars. I
1968AJ.....73..350M