NGC 2251
Number of stars per data source
Reference 97 : 1 star
Reference 206 : 1 star
Reference 389 : 2 stars
References
- 97
- Young A., Martin A.E.
- (1973) Astrophys. J. 181, 805
- A search for Ap stars in open clusters
- 1973ApJ...181..805Y
- 206
- Hiltner W.A.
- (1956) Astrophys. J. Suppl. 2, 389
- Photometric, polarization and spectrographic observations of O and B stars
- 1956ApJS....2..389H
- 389
- van Rensbergen W., Hammerschlag G., van den Heuvel E.P.J
- (1978) Astron. Astrophys. 64, 131
- Spectroscopic studies of open clusters - A search for Ap stars
- 1978A&A....64..131V