NGC 6613
Number of stars per data source
Reference 206 : 1 star
Reference 383 : 2 stars
Reference 999 : 5 stars
References
- 206
- Hiltner W.A.
- (1956) Astrophys. J. Suppl. 2, 389
- Photometric, polarization and spectrographic observations of O and B stars
- 1956ApJS....2..389H
- 383
- Lindoff U.
- (1971) Astron. Astrophys. 15, 439
- The open clusters NGC 6613 (M18) and NGC 6716
- 1971A&A....15..439L
- 999
- Houk N., Cowley A.P., Smith-Moore M.
- University of Michigan (Ann Arbor) Vol 1 (1975), Vol 2 (1978), Vol 3 (1982), Vol 4 (1988), Vol 5 (1999)
- The University of Michigan Catalogue of two-dimensional Spectral Types for the HD stars
- 1975mctd.book.....H