NGC 581
Number of stars per data source
Reference 290 : 1 star
Reference 345 : 1 star
Reference 542 : 3 stars
References
- 290
- Perry C.L., Johnston L.
- (1982) Astrophys. J. Suppl. 50, 451
- A photometric map of the local interstellar reddening within 300 parsecs
- 1982ApJS...50..451P
- 345
- Olsen E.H.
- (1983) Astron. Astrophys. Suppl. 54, 55
- Four-colour ubvy and Hbeta photometry of A5 to G0 stars brighter than 8.3m
- 1983A&AS...54...55O
- 542
- Javakhishvili G.Sh., Salukvadze G.N.
- (1996) Astrophysics 39, 3
- uvby beta electrophotometry of the components of Trapezium multiple star systems
- 1996Ap.....39....3J