Upgren 1

Number of stars per data source

	Reference  166 :    4 stars
	Reference  297 :    1 star
	Reference  318 :    1 star
	Reference  468 :    4 stars

166: Hilditch R.W., Hill G., Barnes J.V.; (1976) Mem. R. Astr. Soc. 82, 95; Studies of A and F stars in the region of the north galactic pole-II; 1976MmRAS..82...95H
297: Perry C.L., Johnston L., Crawford; (1982) Astron. J. 87, 1751; A photometric map of interstellar reddening within 100 parsecs; 1982AJ.....87.1751P
318: Hill G., Barnes J.v; (1982) Publ. Dominion Astrophys. Obs. XVI, 297; Further studies of A and F stars in the region of the north galactic pole. I. uvby photometry II. beta photometry; 1982PDAO....0..297H
318: Hill G., Barnes J.v; (1982) Publ. Dominion Astrophys. Obs. XVI, 350; Further studies of A and F stars in the region of the north galactic pole. II. beta photometry; 1982PDAO....0..350H
468: Castelaz M.W., Persinger T., Stein J.W., Prosser J., Powell H.D.; (1991) Astron. J. 102, 2103; Photometry of astrometric reference stars; 1991AJ....102.2103C