NGC 6939

Number of stars per data source

	Reference   47 :    5 stars
	Reference  115 :   11 stars

47: Robb R.M., Cardinal R.D.; (1998) Inform. Bull. Var. Stars no 4634; Searching the open cluster NGC 6939 for variable stars; 1998IBVS.4634....0R
115: Kafka S., Gibbs II D.G., Henden A.A., Honeycutt R.K.; (2004) Astron. J. 127, 1622; WIYN open cluster study. XX. Photometric monitoring of the Galactic cluster NGC 6939; 2004AJ....127.1622K