# X Cygni

> variable star in the constellation Cygnus

**Wikidata**: [Q10940912](https://www.wikidata.org/wiki/Q10940912)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/X_Cygni)  
**Source**: https://4ort.xyz/entity/x-cygni


## References

1. General Catalogue of Variable Stars
2. VizieR
3. Color excesses for supergiants and classical Cepheids. I. Calibration of the G-band photometry
4. Catalogue and bibliography of emission-line stars of types later than B
5. A note on the period-spectrum relation among Cepheids
6. SIMBAD
7. Observational studies of cepheid amplitudes. I. Period-amplitude relationships for galactic cepheids and interrelation of amplitudes
8. Catalogue of Stellar Photometry in Johnson's 11-color system
9. Period-colour and amplitude-colour relations in classical Cepheid variables - IV. The multiphase relations
10. Gaia Data Release 2
11. A global physical model for cepheids
12. C, N, O and na abundances of cepheid variables: implications on the mixing process in the envelope
13. A catalogue of stellar rotational velocities
14. Catalogue of rotational velocities of the stars
15. The atmospheric parameters and spectral interpolator for the MILES stars