Ruprecht 55

Number of stars per data source

	Reference  425 :    3 stars
	Reference  490 :   15 stars

425: FitzGerald M.P., Luiken M., Maitzen H.M., Moffat A.F.J.; (1979) Astron. Astrophys. Suppl. 37, 345; Analysis of the results of MK classification of 176 stars in 37 southern open clusters; 1979A&AS...37..345F
490: Bosch G., Barba R., Morrell N., Niemela V., Ostrov P., Arnal M., Cappa C., Morras R., Gimenez de Castro G.; (2003) Mon. Not. R. Astron. Soc. 341, 169; Ruprecht 55: an OB association at the edge of our Galaxy; 2003MNRAS.341..169B