NGC 2539

Number of stars per data source

	Reference   60 :    3 stars
	Reference  999 :    3 stars

60: Pesch P.; (1961) Astrophys. J. 134, 602; Photometric and objective prism observations in three galactic clusters; 1961ApJ...134..602P
999: Houk N., Cowley A.P., Smith-Moore M.; University of Michigan (Ann Arbor) Vol 1 (1975), Vol 2 (1978), Vol 3 (1982), Vol 4 (1988), Vol 5 (1999); The University of Michigan Catalogue of two-dimensional Spectral Types for the HD stars; 1975mctd.book.....H