Berkeley 20

Number of measures per data source

	Reference  508 :    9 measures
	Reference  571 :    6 measures
	Reference  578 :    7 measures

References

 508

Friel E.D., Janes K.A., Tavarez M., Scott J., Katsanis R., Lotz J., Hong L., Miller N.

(2002) Astron. J. 124, 2693

Metallicities of old open clusters

2002AJ....124.2693F

 571

Yong D., Carney B.W., Texeira de Almeida M.L.

(2005) Astron. J. 130, 597

Elemental abundances ratios in stars of the outer galactic disk. I. Open clusters

2005AJ....130..597Y

 578

Frinchaboy P.M., Muñoz R.R., Phelps R.L., Majewski S.R., Kunkel W.E.

(2006) Astron. J. 131, 922

Photometry and Spectroscopy of Old, Outer Disk Star Clusters: vdB-Hagen 176, Berkeley 29 and Saurer 1

2006AJ....131..922F