# Q74226622
**Wikidata**: [Q74226622](https://www.wikidata.org/wiki/Q74226622)  
**Source**: https://4ort.xyz/entity/q74226622


## References

1. SIMBAD
2. Magnitude, color and spectral type relations in the galactic cluster M 39
3. Rotational velocities of stars metallic-line stars in M 39 and the Ursae Major cluster
4. Spectral types in the open cluster M 39
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. Gaia Data Release 2
7. A spectroscopic study of the open cluster M 39
8. Catalogue of rotational velocities of the stars
9. A catalogue of stellar rotational velocities