NGC 6611

Number of stars per data source

	Reference   97 :    1 star
	Reference  169 :   10 stars

97: Bosch G.L., Morrell N.I., Niemela V.S.; (1999) Rev. Mex. Astron. Astrofis. 35, 85; Stellar spectroscopy in NGC 6611: binary frequency and new spectral types of several early type stars; 1999RMxAA..35...85B
169: Sana H., Gosset E., Evans C.J.; (2009) Mon. Not. R. Astron. Soc. 400, 1479; The massive star binary fraction in young open clusters - II. NGC6611 (Eagle Nebula); 2009MNRAS.400.1479S