NGC 7039

Number of stars per data source

	Reference  206 :    1 star
	Reference  211 :    1 star
	Reference  735 :   20 stars

206: Hiltner W.A.; (1956) Astrophys. J. Suppl. 2, 389; Photometric, polarization and spectrographic observations of O and B stars; 1956ApJS....2..389H
211: Walborn N.R.; (1971) Astrophys. J. Suppl. 23, 257; Some spectroscopic characteristics of the OB stars: An investigation of the space distribution of certain OB stars and the reference frame of the classification; 1971ApJS...23..257W
735: Zelwanowa E., Schoeneich W.; (1971) Astr. Nach. 293, 155; Pekuliare A-Sterne in offenen Sternhaufen. I. Photoelektrische UBV- Photometric und MK-Klassifikation von Sternen im Gebiet von NGC 7039; 1971AN....293..155H