# AR Herculis

> RR Lyrae variable star in the constellation Hercules

**Wikidata**: [Q88283672](https://www.wikidata.org/wiki/Q88283672)  
**Source**: https://4ort.xyz/entity/ar-herculis


## References

1. SIMBAD
2. A spectroscopic study of the RR Lyrae stars
3. General Catalogue of Variable Stars, 3rd ed.
4. Mid-infrared period-luminosity relations of RR Lyrae stars derived from the AllWISE Data Release
5. Gaia Data Release 2
6. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
7. The Tycho-2 catalogue of the 2.5 million brightest stars
8. Gaia Early Data Release 3
9. APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South