NGC 637

Number of stars per data source

	Reference  522 :   27 stars

References

 522

Huestamendia G., del Rio G., Mermilliod J.-C.

(1990) Astron. Astrophys. Suppl. 87, 153

UBV photometry of open clusters in the Cassiopeia region. I. Photoelectric observations of NGC 436 and 637

1990A&AS...87..153H