Trumpler 9

Number of stars per data source

	Reference  434 :   26 stars
	Reference  877 :    1 star
	Reference 1047 :   14 stars

434: Vogt N., Moffat A.F.J.; (1972) Astron. Astrophys. Suppl. 7, 133; Southern open clusters I. UBV and Hbeta photometry of 15 clusters between galactic longitudes 231 and 256; 1972A&AS....7..133V
877: Loden L.O.; (1969) Ark. Astron. 5, 149; Photometric standard sequences in Puppis; 1969ArA.....5..149L
1047: Pismis P.; (1970) Bol. Obs. Tonantzintla Tacubaya 5, 293; Studies on star clusters. The open cluster Tr 9; 1970BOTT....5..293P