# VX Herculis

> RR Lyrae variable star in the constellation Hercules

**Wikidata**: [Q88174565](https://www.wikidata.org/wiki/Q88174565)  
**Source**: https://4ort.xyz/entity/vx-herculis


## References

1. SIMBAD
2. VizieR
3. Summary of delta-S metallicity measurements for bright RR Lyrae variables observed at Lick Observatory and KPNO between 1972 and 1987
4. General Catalogue of Variable Stars, 3rd ed.
5. ROTSE all-sky surveys for variable stars. I. Test fields
6. Mid-infrared period-luminosity relations of RR Lyrae stars derived from the AllWISE Data Release
7. Probing the outer galactic halo with RR Lyrae from the Catalina surveys
8. Gaia Data Release 2
9. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
10. Gaia Early Data Release 3
11. Gaia Data Release 3
12. On the Use of Field RR Lyrae as Galactic Probes. III. The α-element Abundances
13. On the Use of Field RR Lyrae as Galactic Probes. II. A New ΔS Calibration to Estimate Their Metallicity
14. Chemical abundances of solar neighbourhood RR Lyrae stars