NGC 6618
Number of stars per data source
Reference 19 : 1 star
Reference 173 : 2 stars
Reference 392 : 4 stars
Reference 394 : 36 stars
Reference 1303 : 70 stars
References
- 19
- Hiltner W.A., Johnson H.L.
- (1956) Astrophys. J. 124, 367
- The law of interstellar reddening and absorption
- 1956ApJ...124..367H
- 173
- Hiltner W.A.
- (1956) Astrophys. J. Suppl. 2, 389
- Photometric polarization and spectrographic observations of O and B Stars
- 1956ApJS....2..389H
- 392
- Crampton D., Georgelin Y.M., Georgelin Y.P.
- (1978) Astron. Astrophys. 66, 1
- First optical detection of W51 and observations of new HII regions and exciting stars
- 1978A&A....66....1C
- 394
- Chini R., Elsaesser H., Neckel T.
- (1980) Astron. Astrophys. 91, 186
- Multicolour UBVRI photometry of stars in M17
- 1980A&A....91..186C
- 1303
- Ogura K., Ishida K.
- (1976) Publ. Astron. Soc. Japan 28, 35
- UBV photometry of the stars in the fields of emission nebulae. II. M17
- 1976PASJ...28...35O