Stephenson 1

Number of stars per data source

	Reference  140 :   72 stars
	Reference  908 :    6 stars

140: Eggen O.J.; (1968) Astrophys. J. 152, 77; Photometric evidence for the existence of a Delta Lyrae cluster; 1968ApJ...152...77E
908: von Bronkalla W.; (1963) Astron. Nach. 287, 249; UBV-Photometrie des Sternfeldes um Delta Lyrae; 1963AN....287..249B