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