NGC 6613
Number of stars per data source
Reference 173 : 1 star
Reference 239 : 7 stars
Reference 378 : 13 stars
References
- 173
- Hiltner W.A.
- (1956) Astrophys. J. Suppl. 2, 389
- Photometric polarization and spectrographic observations of O and B Stars
- 1956ApJS....2..389H
- 239
- Racine R.
- (1968) Astron. J. 73, 233
- Stars in reflection nebulae
- 1968AJ.....73..233R
- 378
- Lindoff U.
- (1971) Astron. Astrophys. 15, 439
- The open clusters NGC 6613 (M18) and NGC 6716
- 1971A&A....15..439L