NGC 6997

Number of stars per data source

	Reference  408 :   17 stars

References

 408

Villanova S., Baume G., Carraro G., Geminale A.

(2004) Astron. Astrophys. 419, 149

Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula

2004A&A...419..149V