Berkeley 18

Number of stars per data source

	Reference   73 : 1004 stars

References

 73

Carraro G., Vallenari A., Girardi L., Richichi A.

(1999) Astron. Astrophys 343, 825

Near IR photometry of the old open clusters Berkeley 17 and Berkeley 18. Probing the age of the Galactic Disk

1999A&A...343..825C