# QR Hydrae

> Algol variable in the constellation Hydra

**Wikidata**: [Q85400095](https://www.wikidata.org/wiki/Q85400095)  
**Source**: https://4ort.xyz/entity/qr-hydrae


## References

1. SIMBAD
2. Search for associations containing young stars (SACY). I. Sample and searching method
3. Source
4. Gaia Data Release 3
5. TESS Eclipsing Binary Stars. I. Short-cadence Observations of 4584 Eclipsing Binaries in Sectors 1–26
6. Temperature and Distance Dependence of Tidal Circularization in Close Binaries: A Catalog of Eclipsing Binaries in the Southern Hemisphere Observed by the TESS Satellite
7. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
8. ASAS photometry of ROSAT sources. I. Periodic variable stars coincident with bright sources from the ROSAT All Sky Survey
9. Gaia Early Data Release 3
10. The Geneva-Copenhagen survey of the Solar neighbourhood. II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk
11. Gaia Data Release 2
12. New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s)